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Guiding of Reason, by Rene Descartes

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Title: A Discourse of a Method for the Well Guiding of Reason
       and the Discovery of Truth in the Sciences

Author: Rene Descartes

Release Date: June 18, 2008 [EBook #25830]

Language: English

Character set encoding: ISO-8859-1

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  A Discourse
  _OF A_
  METHOD
  For the well guiding of
  REASON,
  And the Discovery of _Truth_
  In the
  SCIENCES.

  [Illustration]

  LONDON,
  Printed by _Thomas Newcombe_.
  MDCXLIX.




To the _Understanding READER_.

The Great DESCARTES (who may justly challenge the first place amongst
the Philosophers of this Age) is the Author of this Discourse; which in
the Originall was so well known, That it could be no mans but his own,
that his Name was not affix'd to it: I need say no more either of Him
or It; He is best made known by Himself, and his Writings want nothing
but thy reading to commend them. But as those who cannot compasse the
Originals of _Titian_ and _Van-Dyke_, are glad to adorne their Cabinets
with the Copies of them; So be pleased favourably to receive his Picture
from my hand, copied after his own Designe: You may therein observe the
lines of a well form'd Minde, The hightnings of Truth, The sweetnings
and shadowings of Probabilities, The falls and depths of Falshood; all
which serve to perfect this Masterpiece. Now although my after-draught
be rude and unpolished, and that perhaps I have touch'd it too boldly,
The thoughts of so clear a Minde, being so extremely fine, That as the
choisest words are too grosse, and fall short fully to expresse such
sublime Notions; So it cannot be, but being transvested, it must
necessarily lose very much of its native Lustre: Nay, although I am
conscious (notwithstanding the care I have taken neither to wrong the
Authours Sense, nor offend the Readers Ear) of many escapes which I have
made; yet I so little doubt of being excused, That I am confident, my
endeavour cannot but be gratefull to all Lovers of Learning; for whose
benefit I have Englished, and to whom I addresse this Essay, which
contains a Method, by the Rules whereof we may Shape our better part,
Rectifie our Reason, Form our Manners and Square our Actions, Adorn our
Mindes, and making a diligent Enquiry into Nature, wee may attain to the
Knowledge of the Truth, which is the most desirable union in the World.

Our Authour also invites all letterd men to his assistance in the
prosecution of this Search; That for the good of Mankinde, They would
practise and communicate Experiments, for the use of all those who
labour for the perfection of Arts and Sciences: Every man now being
obliged to the furtherance of so beneficiall an Undertaking, I could not
but lend my hand to open the Curtain, and discover this New Model of
Philosophy; which I now publish, neither to humour the present, nor
disgust former times; but rather that it may serve for an innocent
Divertisement to those, who would rather Reform themselves, then the
rest of the world; and who, having the same seeds and grounds, and
knowing That there is nothing New under the Sun; That Novelty is but
Oblivion, and that Knowledge is but Remembrance, will study to finde
out in themselves, and restore to Posterity those lost Arts, which
render Antiquity so venerable; and strive (if it be possible) to go
beyond them in other things, as well as Time: Who minde not those things
which are above, beyond, or without them; but would rather limit their
desires by their power, then change the Course of Nature; Who seek the
knowledge, and labour for the Conquest of themselves; Who have Vertue
enough to make their own Fortune; And who prefer the Culture of the
Minde before the Adorning of the Body; To such as these I present this
Discourse (whose pardon I beg, for having so long detain'd them from so
desirable a Conversation;) and conclude with this Advice of the Divine
_Plato_:

    _Cogita in te, præter Animum, nihil esse mirabile._





A DISCOURSE OF A METHOD, For the wel-guiding of Reason; AND The
discovery of Truth in the SCIENCES.


_If this Discourse seem too long to be read at once, it may be divided
into six parts. In the first, are divers Considerations touching the
Sciences. In the second, the principall Rules of that Method which the
Author hath studyed. In the third, some of those in morality, which he
hath drawn from this Method. In the fourth, the reasons whereby the
existence of God and of the humane Soul is proved; which are the
grounds of his Metaphysicks. In the fift, the order of these Physicall
questions, which he hath examined, and particularly the explication of
the hearts motion; with some other difficulties relating to Physick; as
also the difference between our Souls and those of beasts. In the last,
what he conceives requisit to make a further inquiry into Nature, then
hath hitherto been made. And what reasons induc'd him to write._




PART. I.


Right understanding is the most equally divided thing in the World; for
every one beleevs himself so well stor'd with it, that even those who in
all other things are the hardest to be pleas'd, seldom desire more of it
then they have; wherein it is not likely that all Men are deceived: But
it rather witnesseth, That the faculty of right-judging and
distinguishing truth from falshood (which is properly call'd,
Understanding or Reason) is naturally equal in all Men. And as the
diversity of our Opinions, is not, because some are more reasonable then
others; but only that we direct our thoughts several ways, neither do we
consider the same things. For 'tis not enough to have good faculties,
but the principal is, to apply them well. The greatest Souls are as
capable of the greatest Vices, as of the most eminent Vertues: And those
who move but very slowly, may advance much farther, if they always
follow the right way; then those who run and straggle from it.

For my part, I never presum'd that my Minde was more perfect in any
thing then an ordinary Mans; nay, I have often wish'd to have had my
thoughts as quick, my imagination as clear and distinct, and my memory
as large and as ready as some other Men have had. And I know no
Qualities which serve more then those to the perfection of the Minde;
for as for Reason or Understanding, forasmuch as it is the only thing
which makes us Men, and distinguisheth us from beasts, I will beleeve it
to be entire in every One, and follow herein the common opinion of the
Philosophers, who say, That there is only more or less among the
Accidents, and not amongst the Forms or nature of the Individuals of one
species.

But I shall not stick to say, That I beleeve my self very happy, in
having encountred from my youth with certain ways which have led me to
considerations and Maximes, from which I have found a Method; whereby
methinks, I have the means by degrees to augment my knowledg, and by
little and little to raise it up to the highest pitch, whereto the
meaness of my capacity, & the short course of my life can permit it to
attain. For I have already reaped such fruits from it, that although in
the judgment I make of my self, I endevour always rather to incline to
mistrust, then to presumption. And looking on the divers actions and
undertakings of all Men, with the eye of a Philosopher, there is almost
none which to me seems not vain and useless. Yet I am extremely
satisfied with the Progress, which (as it seems to me) I have already
made in the search of Truth, and do conceive such hopes for the future,
That if among the employments of Men, purely Men, there is any solidly
good, and of importance, I dare beleeve it is that which I have chosen:
Yet it may be that I deceive my self, and perhaps it is but a little
Copper and Glass which I take for Gold and Diamonds. I know how subject
we are to mistake in those things which concern us, and how jealous we
ought to be of the judgment of our friends, when it is in our favor. But
I should willingly in this Discourse, trace out unto you the ways which
I have followed, and represent therein my life, as in a Picture, to the
end, that every one may judge thereof; and that learning from common
Fame, what mens opinions are of it, I may finde a new means of
instructing my self; which I shall add to those which I customarily make
use of.

Neither is it my design to teach a Method which every Man ought to
follow, for the good conduct of his reason; but only to shew after what
manner I have endevoured to order mine own. Those who undertake to give
precepts, ought to esteem themselves more able, then those to whom they
give them, and are blame-worthy, if they fail in the least. But
proposing this but as a History, or if you will have it so, but as a
Fable; wherein amongst other examples, which may be imitated, we may
perhaps find divers others which we may have reason to decline: I hope
it will be profitable to some, without being hurtfull to any; and that
the liberty I take will be gratefull to all.

I have been bred up to Letters from mine infancy; & because I was
perswaded, that by their means a man might acquire a clear and certain
knowledg of all that's usefull for this life, I was extremely desirous
to learn them: But as soon as I had finish'd all the course of my
Studies, at the end whereof Men are usually receiv'd amongst the rank of
the learned. I wholly changed my opinion, for I found my self intangled
in so many doubts and errors, that me thought I had made no other profit
in seeking to instruct my self, but that I had the more discovered mine
own ignorance. Yet I was in one of the most famous Schools in _Europe_;
where I thought, if there were any on earth, there ought to have been
learned Men. I had learnt all what others had learnt; even unsatisfied
with the Sciences which were taught us, I had read over all Books
(which I could possibly procure) treating of such as are held to be the
rarest and the most curious. Withall, I knew the judgment others made of
me; and I perceiv'd that I was no less esteem'd then my fellow Students,
although there were some amongst them that were destin'd to fill our
Masters rooms. And in fine, our age seem'd to me as flourishing and as
fertile of good Wits, as any of the preceding, which made me take the
liberty to judg of all other men by my self, and to think, That there
was no such learning in the world, as formerly I had been made beleeve.

Yet did I continue the esteem I had of those exercises which are the
employments of the Schools: I knew that Languages which are there
learnt, are necessary for the understanding of ancient Writers, That the
quaintness of Fables awakens the Minde; That the memorable actions in
History raise it up, and that being read with discretion, they help to
form the judgment. That the reading of good books, is like the
conversation with the honestest persons of the past age, who were the
Authors of them, and even a studyed conversation, wherein they discover
to us the best only of their thoughts. That eloquence hath forces &
beauties which are incomparable. That Poetry hath delicacies and sweets
extremly ravishing; That the Mathematicks hath most subtile inventions,
which very much conduce aswel to content the curious, as to facilitate
all arts, and to lessen the labour of Men: That those writings which
treat of manners contain divers instructions, and exhortations to
vertue, which are very usefull. That Theology teacheth the way to
heaven; That Philosophy affords us the means to speake of all things
with probability, and makes her self admir'd, by the least knowing Men.
That Law, Physick and other sciences bring honor and riches to those who
practice them; Finally that its good to have examin'd them all even the
falsest and the most superstitious, that we may discover their just
value, and preserve our selves from their cheats.

But I thought I had spent time enough in the languages, and even also in
the lecture of ancient books, their histories and their fables. For 'tis
even the same thing to converse with those of former ages, as to travel.
Its good to know something of the manners of severall Nations, that we
may not think that all things against our _Mode_ are ridiculous or
unreasonable, as those are wont to do, who have seen Nothing. But when
we employ too long time in travell, we at last become strangers to our
own Country, and when we are too curious of those things, which we
practised in former times, we commonly remain ignorant of those which
are now in use. Besides, Fables make us imagine divers events possible,
which are not so: And that even the most faithfull Histories, if they
neither change or augment the value of things, to render them the more
worthy to be read, at least, they always omit the basest and less
remarkable circumstances; whence it is, that the rest seems not as it
is; and that those who form their Manners by the examples they thence
derive, are subject to fall into the extravagancies of the _Paladins_ of
our Romances, and to conceive designes beyond their abilities.

I highly priz'd Eloquence, and was in love with Poetry; but I esteem'd
both the one and the other, rather gifts of the Minde, then the fruits
of study. Those who have the strongest reasoning faculties, and who best
digest their thoughts, to render them the more clear and intelligible,
may always the better perswade what they propose, although they should
speak but a corrupt dialect, and had never learnt Rhetorick: And those
whose inventions are most pleasing, and can express them with most
ornament and sweetness, will still be the best Poets; although ignorant
of the Art of Poetry.

Beyond all, I was most pleas'd with the Mathematicks, for the certainty
and evidence of the reasons thereof; but I did not yet observe their
true use, and thinking that it served only for Mechanick Arts; I
wondred, that since the grounds thereof were so firm and solid, that
nothing more sublime had been built thereon. As on the contrary, I
compar'd the writings of the Ancient heathen which treated of Manner, to
most proud and stately Palaces which were built only on sand and mire,
they raise the vertues very high, and make them appear estimable above
all the things in the world; but they doe not sufficiently instruct us
in the knowledg of them, and often what they call by that fair Name, is
but a stupidness, or an act of pride, or of despair, or a paricide.

I reverenc'd our Theology, and pretended to heaven as much as any; But
having learnt as a most certain Truth, that the way to it, is no less
open to the most ignorant, then to the most learned; and that those
revealed truths which led thither, were beyond our understanding, I
durst not submit to the weakness of my ratiocination. And I thought,
that to undertake to examine them, and to succeed in it, requir'd some
extraordinary assistance from heaven, and somewhat more then Man. I
shall say nothing of Philosophy, but that seeing it hath been cultivated
by the most excellent wits, which have liv'd these many ages, and that
yet there is nothing which is undisputed, and by consequence, which is
not doubtfull. I could not presume so far, as to hope to succeed better
then others. And considering how many different opinions there may be on
the same thing, maintain'd by learned Men, and yet that there never can
be but one only Truth, I reputed almost all false, which had no more
then probability in it.

As for other Sciences, since they borrow their Principles from
Philosophy, I judg'd that nothing which was solid could be built upon
such unsound foundations; and neither honour nor wealth were sufficient
to invite me to the study of them. For (I thank God) I found not my self
in a condition which obliged me to make a Trade of Letters for the
relief of my fortune. And although I made it not my profession to
despise glory with the Cynick; yet did I little value that which I could
not acquire but by false pretences. And lastly, for unwarrantable
Studies, I thought I already too well understood what they were, to be
any more subject to be deceived, either by the promises of an Alchymist,
or by the predictions of an Astrologer, or by the impostures of a
Magician, or by the artifice or brags of those who profess to know more
then they do.

By reason whereof, as soon as my years freed me from the subjection of
my Tutors, I wholly gave over the study of Letters, and resolving to
seek no other knowledge but what I could finde in my self, or in the
great book of the World, I imployed the rest of my youth in Travell, to
see Courts and Armies, to frequent people of severall humors and
conditions, to gain experience, to hazard my self in those encounters of
fortune which should occurr; and every-where to make such a reflection
on those things which presented themselves to me, that I might draw
profit from them. For (me thought) I could meet with far more truth in
the discourses which every man makes touching those affairs which
concern him, whose event would quickly condemn him, if he had judg'd
amisse; then amongst those which letter'd Men make in their closets
touching speculations, which produce no effect, and are of no
consequence to them, but that perhaps they may gain so much the more
vanity, as they are farther different from the common understanding:
Forasmuch as he must have imployed the more wit and subtilty in
endeavouring to render them probable. And I had always an extreme desire
to learn to distinguish Truth from Falshood, that I might see cleerly
into my actions, and passe this life with assurance.

Its true, that whiles I did but consider the Manners of other men, I
found little or nothing wherein I might confirm my self: And I observ'd
in them even as much diversity as I had found before in the opinions of
the Philosophers: So that the greatest profit I could reap from them
was, that seeing divers things, which although they seem to us very
extravagant and ridiculous, are nevertheless commonly received and
approved by other great Nations, I learn'd to beleeve nothing too
firmly, of what had been onely perswaded me by example or by custom, and
so by little and little I freed my self from many errors, which might
eclipse our naturall light, and render us lesse able to comprehend
reason. But after I had imployed some years in thus studying the Book of
the World, and endeavouring to get experience, I took one day a
resolution to study also within my self, and to employ all the forces of
my minde in the choice of the way I was to follow: which (me thought)
succeeded much better, then if I had never estranged my self from my
Country, or from my Books.




PART. II.


I was then in _Germany_, whither the occasion of the Wars (which are not
yet finished) call'd me; and as I return'd from the Emperors Coronation
towards the Army, the beginning of Winter stopt me in a place, where
finding no conversation to divert me and on the other sides having by
good fortune no cares nor passions which troubled me, I stayd alone the
whole day, shut up in my Stove, where I had leasure enough to entertain
my self with my thoughts. Among which one of the first was that I betook
my self to consider, That oft times there is not so much perfection in
works compos'd of divers peeces, and made by the hands of severall
masters, as in those that were wrought by one only: So we may observe
that those buildings which were undertaken and finished by one onely,
are commonly fairer and better ordered then those which divers have
laboured to patch up, making use of old wals, which were built for other
purposes; So those ancient Cities which of boroughs, became in a
succession of time great Towns, are commonly so ill girt in comparison
of other regular Places, which were design'd on a flatt according to the
fancy of an Engeneer; and although considering their buildings
severally, we often find as much or more art, then in those of other
places; Yet to see how they are rank'd here a great one, there a little
one, and how they make the streets crooked and uneven, One would say,
That it was rather Fortune, then the will of Men indued with reason,
that had so disposed them. And if we consider, that there hath always
been certain Officers, whose charge it was, to take care of private
buildings, to make them serve for the publique ornament; We may well
perceive, that it's very difficult, working on the works of others, to
make things compleat. So also did I imagine, that those people who
formerly had been half wilde, and civiliz'd but by degrees, made their
laws but according to the incommodities which their crimes and their
quarrels constrain'd them to, could not be so wel pollic'd, as those who
from the beginning of their association, observ'd the constitutions of
some prudent Legislator. As it is very certain, that the state of the
true Religion, whose Ordinances God alone hath made, must be
incomparably better regulated then all others. And to speak of humane
things, I beleeve that if _Sparta_ hath formerly been most flourishing,
it was not by reason of the goodness of every of their laws in
particular, many of them being very strange, and even contrary to good
manners, but because they were invented by one only, They all tended to
One End. And so I thought the sciences in Books, at least those whose
reasons are but probable, and which have no demonstrations, having been
compos'd of, and by little and little enlarg'd with, the opinions of
divers persons, come not so near the Truth, as those simple reasonings
which an understanding Man can naturally make, touching those things
which occurr. And I thought besides also, That since we have all been
children, before we were Men; and that we must have been a long time
govern'd by our appetites, and by our Tutors, who were often contrary to
one another, and neither of which alwayes counsel'd us for the best;
It's almost impossible that our judgment could be so clear or so solid,
as it might have been, had we had the intire use of our reason from the
time of our birth, and been always guided by it alone.

Its true, we doe not see the houses of a whole Town pull'd down
purposely to re build them of another fashion; and to make the streets
the fairer; But we often see, that divers pull their own down to set
them up again, and that even sometimes they are forc'd thereunto, when
they are in danger to fall of themselves, and that their foundations are
not sure. By which example I perswaded my self, that there was no sense
for a particular person, to design the Reformation of a State, changing
all from the very foundations, and subverting all to redress it again:
Nor even also to reform the bodies of Sciences, or the Orders already
established in the Schools for teaching them. But as for all the
Opinions which I had till then receiv'd into my beleef, I could not doe
better then to undertake to expunge them once for all, that afterwards I
might place in their stead, either others which were better, or the same
again, as soon as I should have adjusted them to the rule of reason. And
I did confidently beleeve, that by that means I should succeed much
better in the conduct of my life, then if I built but on old
foundations, and only relyed on those principles, which I suffer'd my
self to be perswaded to in my youth, without ever examining the Truth of
them. For although I observ'd herein divers difficulties, yet were they
not without cure, nor comparable to those which occurr in the
reformation of the least things belonging to the publick: these great
bodies are too unweldy to be rais'd; being cast down, or to be held up
when they are shaken, neither can their falls be but the heavyest.

As for their imperfections, if they have any, as the only diversity
which is amongst them, is sufficient to assure us that many have.
Custome hath (without doubt) much sweetned them, and even it hath made
others wave, or insensibly correct a many, whereto we could not so well
by prudence have given a remedy. And in fine, They are alwayes more
supportable, then their change can be, Even, as the great Roads, which
winding by little and little betwixt mountains, become so plain and
commodious, with being often frequented, that it's much better to follow
them, then to undertake to goe in a strait line by climbing over the
rocks, and descending to the bottom of precipices. Wherefore I can by no
means approve of those turbulent and unquiet humors, who being neither
call'd by birth or fortune to the managing of publique affairs, yet are
alwayes forming in _Idea_, some new Reformation. And did I think there
were the least thing in this Discourse, which might render me suspected
of that folly, I should be extremely sorry to suffer it to be published;
I never had any designe which intended farther then to reform my own
thoughts and to build on a foundation which was wholly mine. But though
I present you here with a Modell of my work, because it hath
sufficiently pleased me; I would not therefore counsell any one to
imitate it. Those whom God hath better endued with his graces, may
perhaps have more elevated designes; but I fear me, lest already this be
too bold for some. The resolution only of quitting all those opinions
which we have formerly receiv'd into our belief, is not an example to be
followed by every One; and the world is almost compos'd but of two sorts
of Men, to whom it's no wayes convenient, to wit, of those, who
beleeving themselves more able then they are, cannot with-hold
themselves from precipitating their judgments, nor have patience enough
to steer all their thoughts in an orderly course. Whence it happens,
that if they should once take the liberty to doubt of those principles
which they have already received, and to stray from the common road,
they could never keep the path which leads strait forwards, and so,
would straggle all their lives. And of such who having reason and
modesty enough to judg that they are less able to distinguish truth from
falshood then others, from whom they may receive instruction, ought much
rather to be content to follow other Mens opinions, rather then to seek
after better themselves.

And for my part, I had undoubtedly been of the number of those latter,
had I never had but one Master, or had I not known the disputes which
have alwayes hapned amongst the most learned. For having learnt from
the very School, That one can imagin nothing so strange or incredible,
which had not been said by some one of the Philosophers; And having
since observ'd in my travails, That all those whose opinions are
contrary to ours, are not therefore barbarous or savage, but that many
use as much or more reason then we; and having consider'd how much one
Man with his own understanding, bred up from his childhood among the
French or the Dutch, becomes different from what he would be, had he
alwayes liv'd amongst the _Chineses_, or the _Cannibals_: And how even
in the fashion of our Clothes, the same thing which pleas'd ten years
since, and which perhaps wil please ten years hence, seems now to us
ridiculous and extravagant. So that it's much more Custome and Example
which perswades us, then any assured knowledg; and notwithstanding that
plurality of voices is a proof of no validity, in those truths which
are hard to be discovered; for that it's much more likely for one man
alone to have met with them, then a whole Nation; I could choose no Man
whose opinion was to be preferr'd before anothers: And I found my self
even constrain'd to undertake the conduct of my self.

But as a man that walks alone, and in the dark, I resolv'd to goe so
softly, and use so much circumspection in all things, that though I
advanc'd little, I would yet save my self from falling. Neither would I
begin quite to reject, some opinions, which formerly had crept into my
belief, without the consent of my reason, before I had employed time
enough to form the project of the work I undertook, and to seek the true
Method to bring me to the knowledg of all those things, of which my
understanding was capable.

I had a little studyed, being young, of the parts of Philosophy, Logick,
and of the Mathematicks, the Analysis of the Geometricians, and
_Algebra_: Three arts or sciences which seem'd to contribute somewhat
conducing to my designe: But examining them, I observ'd, That as for
Logick, its Sylogisms, and the greatest part of its other Rules, serve
rather to expound to another the things they know, or even as _Lullies_
art, to speak with judgment of the things we are ignorant of, then to
learn them. And although in effect it contain divers most true and good
precepts, yet there are so many others mixed amongst them, either
hurtfull or superfluous, That it's even as difficult to extract them, as
'tis to draw a _Diana_ or a _Mercury_ out of a lump of Marble, which is
not yet rough-hewn; as for the Analysis of the Ancients, and the
_Algebra_ of the Moderns; besides that, they extend only to matters very
abstract, and which seem to be of no use; The first being alwayes so
tyed to the consideration of figures, That it cannot exercise the
understanding, without very much tiring the imagination. And in the
latter they have so subjected themselves to certain Rules and cyphers,
that they have made a confus'd and obscure art which perplexeth the
minde, in stead of a Science to instruct it. For this reason, I thought
I ought to seek some other Method, which comprehending the advantages of
these, they might be exempt from their defects. And as the multitude of
Laws often furnisheth excuses for vice; so a State is fair better
polic'd, when having but a few, they are very strictly observ'd therein:
So, instead of the great many precepts whereof Logick is compos'd, I
thought these four following would be sufficient for me, if I took but a
firm and constant resolution not once to fail in the observation of
them.

The first was, never to receive any thing for true, but what I evidently
knew to be so; that's to say, Carefully to avoid Precipitation and
Prevention, and to admit nothing more into my judgment, but what should
so clearly and distinctly present it self to my minde, that I could have
no reason to doubt of it.

The second, to divide every One of these difficulties, which I was to
examine into as many parcels as could be, and, as was requisite the
better to resolve them.

The third, to lead my thoughts in order, beginning by the most simple
objects, and the easiest to be known; to rise by little and little, as
by steps, even to the knowledg of the most mixt; and even supposing an
Order among those which naturally doe not precede one the other.

And the last, to make every where such exact calculations, and such
generall reviews, That I might be confident to have omitted Nothing.

Those long chains of reasons, (though simple and easie) which the
Geometricians commonly use to lead us to their most difficult
demonstrations, gave me occasion to imagine, That all things which may
fall under the knowledg of Men, follow one the other in the same manner,
and so we doe only abstain from receiving any one for true, which is not
so, and observe alwayes the right order of deducing them one from the
other, there can be none so remote, to which at last we shall not
attain; nor so hid, which we shall not discover. Neither was I much
troubled to seek by which it behooved me to begin, for I already knew,
that it was by the most simple, and the easiest to be discern'd. But
considering, that amongst all those who formerly have sought the Truth
in Learning, none but the Mathematicians only could finde any
demonstrations, that's to say, any certain and evident reasons. I
doubted not, but that it was by the same that they have examin'd;
although I did hope for no other profit, but only that they would
accustome my Minde to nourish it self with Truths, and not content it
self with false Reasons. But for all this, I never intended to endevour
to learn all those particular Sciences which we commonly call'd
Mathematicall; And perceiving, that although their objects were
different, yet did they nevertheless agree altogether, in that they
consider no other thing, but the divers relations or proportions which
are found therein; I thought it therefore better to examine those
proportions in generall, and without supporting them but in those
subjects, which might the more easily serve to bring me to the knowledg
of them. But withall, without any wayes limiting them, That I might
afterwards the better sit them to all others whereto they might be
applyed. Having also observ'd, That to know them, it would be sometimes
needfull for me to consider every one in particular, or sometimes only
to restrain them, or comprehend many together; I thought, that to
consider them the better in particular I ought to suppose them in
lines, for as much as I find nothing more simple, nor which I could more
distinctly represent to my imagination, and to my sences; But to hold or
comprehend many in one, I was oblig'd to explain them by certain Cyphers
the shortest I possibly could, and that I should thereby borrow the best
of the Geometricall Analysis, and of Algebra, & so correct all the
defects of the one by the other.

As in effect I dare say, That the exact observation of those few
precepts I had chosen, gave me such a facility to resolve all the
questions whereto these two sciences extend; That in two or three months
space which I employed in the examination of them, having begun by the
most simple and most generall, and every Truth which I found being a
rule which afterwards served me to discover others; I did not only
compasse divers truths which I had formerly judged most difficult, But
me thought also that towards the end I could determin even in those
which I was ignorant of, by what means and how farr it was possible to
resolve them. Wherein perhaps I shall not appear to be very vain if you
consider, That there being but one truth of every thing, who ever finds
it, knows as much of it as one can know; And that for example a child
instructed in Arithmatick having made an addition according to his
rules, may be sure to have found, touching the sum he examined, all what
the wit of man could finde out. In a word the method which teacheth to
folow a right order, and exactly to enumerate all the circumstances of
what we seek, contains, whatsoever ascertains the rules of Arithmatick.

But that which pleas'd me most in this Method was the assurance I had,
wholly to use my reason, if not perfectly, at least as much as it was in
my power; Besides this, I perceived in the practice of it, my minde by
little and little accustom'd it self to conceive its objects more
clearly and distinctly; and having not subjected it to any particular
matter, I promised my self to apply it also as profitable to the
difficulties, of other sciences as I had to Algebra: Not that I
therefore durst at first undertake to examine all which might present
themselves, for that were contrary to the order it prescribes. But
having observ'd that all their principles were to be borrowed from
Philosophy, in which I had yet found none that were certain, I thought
it were needfull for me in the first place to endevor to establish some,
and that this being the most important thing in the world, wherein
precipitation and prevention were the most to be feared, I should not
undertake to performe it, till I had attain'd to a riper Age then XXIII.
which was then mine. Before I had formerly employed a long time in
preparing my self thereunto, aswel in rooting out of my minde all the
ill opinions I had before that time received, as in getting a stock of
experience to serve afterwards for the subject of my reasonings, and in
exercising my self always in the Method I had prescribed. That I might
the more and more confine my self therein.




PART. III.


But as it is not enough to pull down the house where we dwell, before we
begin to re-edify it, and to make provision of materials and architects,
or performe that office our selves; nor yet to have carefully laid the
design of it; but we must also have provided our selves of some other
place of abode during the time of the rebuilding: So that I might not
remain irresolute in my actions, while reason would oblige me to be so
in my judgments, and that I might continue to live the most happily I
could, I form'd for my own use in the interim a Moral, which consisted
but of three or four Maximes, which I shall communicate unto you.

The first was to obey the lawes and customes of my Country, constantly
adhæring to that Religion wherein by the grace of God I had from mine
infancy bin bred. And in all other things behaving my self according to
the most moderate opinions and those which were farthest from excesse,
which were commonly received in practice by the most judicious Men,
amongst whom I was to live: For beginning from that very time, to reckon
mine own for nothing, because I could bring them all to the test, I was
confident I could not do better then follow those of the deepest sense;
and although perhaps there are as understanding men amongst the Persians
or Chineses as amongst us, yet I thought it was more fit to regulate my
self by those with whom I was to live, and that I might truly know what
their opinions were, I was rather to observe what they practic'd, then
what they taught. Not only by reason of the corruption of our manners,
there are but few who will say, all they beleeve, but also because
divers are themselves ignorant of it; for the act of the thought by
which we beleeve a thing, being different from that whereby we know that
we believe it, the one often is without the other. And amongst divers
opinions equally receiv'd, I made choise of the most moderate only, as
well because they are always the most fit for practice, and probably the
best, all excess being commonly ill; As also that I might less err from
the right way, if I should perhaps miss it, then if having chosen one of
the extremes, it might prove to be the other, which I should have
followed. And particularly I plac'd amongst extremities, all those
promises by which we somwhat restrain our liberty. Not that I
disapproved the laws, which to cure the inconstancy of weak minds,
permit us when we have any good design, or else for the preservation of
Commerce, one that is but indifferent, to make vows or contracts, which
oblige us to persevere in them: But because I saw nothing in the world
remain always in the same state; and forming own particular, promised my
self to perfect more and more my judgment, and not to impair it, I
should have thought my self guilty of a great fault against right
understanding, if because I then approved any thing, I were also
afterwards oblig'd to take it for good, when perhaps it ceased to be so,
or that I had ceased to esteem it so.

My second Maxime was, To be the most constant and resolute in my actions
that I could; and to follow with no less perseverance the most doubtfull
opinions, when I had once determined them, then if they had been the
most certain. Imitating herein Travellers, who having lost their way in
a Forrest, ought not to wander, turning now this way, and then that, and
less to abide in one place; but stil advance straight forwards, towards
one way, and not to change on slight occasions, although perhaps at
first Chance only mov'd them to determine that choice: For by that
means, if they do not go directly whither they desire, they will at
least arrive somewhere where they will probably be better then in the
midst of a Forrest. So the actions of this life admitting often of no
delay, its a most certain Truth, That when it is not in our power to
discern the truest opinions, we are to follow the most probable: Yea,
although we finde no more probability in the one then in the other, we
yet ought to determine some way, considering them afterwards no more as
doubtful in what they relate to practice; but as most true and certain;
forasmuch as the reason was so, which made us determine it. And this was
sufficient for that time to free me from all the remorse and repentance
which useth to perplex the consciences of those weak and staggering
minds, which inconstantly suffer themselves to passe to the practice of
those things as good, which they afterwards judge evill.

My third Maxime was, To endevour always rather to conquer my self then
Fortune; and to change my desires, rather then the order of the world:
and generally to accustome my self to beleeve, That there is nothing
wholly in our power but our thoughts; so that after we have done our
best, touching things which are without us, all whats wanting of success
in respect of us is absolutely impossible. And this alone seem'd
sufficient to hinder me from desiring any thing which I could not
acquire, and so to render me content. For our will naturally moving us
to desire nothing, but those things which our understanding presents in
some manner as possible, certain it is, that if we consider all the good
which is without us, as equally distant from our power, we should have
no more regret for the want of those which seem due to our births, when
without any fault of ours we shall be deprived of them, then we have in
wanting the possessions of the Kingdoms of _China_ or _Mexico_. And
making (as we say) vertue of necessity, we should no more desire to be
in health being sick, or free being in prison, then we now do, to have
bodies of as incorruptible a matter as diamonds, or wings to fly like
birds. But I confess, that a long exercise, and an often reiterated
meditation, is necessary to accustom us to look on all things with that
byass: And I beleeve, in this principally consists, the secret of those
Philosophers who formerly could snatch themselves from the Empire of
Fortune, and in spight of pains and poverty, dispute felicity with their
Gods, for imploying themselves incessantly in considering the bounds
which Nature had prescribed them, they so perfectly perswaded
themselves, That nothing was in their power but their thoughts, that,
that onely was enough to hinder them from having any affection for other
things. And they disposed so absolutely of them, that therein they had
some reason to esteem themselves more rich and powerfull, more free and
happy then any other men; who wanting this _Philosophy_, though they
were never so much favoured by Nature and Fortune, could never dispose
of all things so well as they desired.

Lastly, To conclude these Morals, I thought fit to make a review of mens
severall imployments in this life, that I might endeavour to make choice
of the best, and without prejudice to other mens, I thought I could not
do better then to continue in the same wherein I was, that is, to imploy
all my life in cultivating my Reason, and advancing my self, as far as I
could in the knowledge of Truth, following the Method I had prescribed
myself. I was sensible of such extreme contentment since I began to use
this Method, that I thought none could in this life be capable of any
more sweet and innocent: and daily discovering by means thereof, some
Truths which seemed to me of importance, and commonly such as other men
were ignorant of, the satisfaction I thereby received did so possesse my
minde, as if all things else concern'd me not. Besides, that the three
preceding Maximes were grounded only on the designe I had, to continue
the instruction of my self. For God having given to every one of us a
light to discern truth from falsehood, I could not beleeve I ought to
content my self one moment with the opinions of others, unlesse I had
proposed to my self in due time to imploy my judgment in the examination
of them. Neither could I have exempted my self from scruple in following
them, had I not hoped to lose no occasion of finding out better, if
there were any.

But to conclude, I could not have bounded my desires, nor have been
content, had I not followed a way, whereby thinking my self assured to
acquire all the knowledge I could be capable of: I thought I might by
the same means attain to all that was truly good, which should ever be
within my power; forasmuch as our Will inclining it self to follow, or
fly nothing but what our Understanding proposeth good or ill, to judge
well is sufficient to do well, and to judge the best we can, to do also
what's best; to wit, to acquire all vertues, and with them all
acquirable goods: and whosoever is sure of that, he can never fail of
being content.

After I had thus confirmed my self with these Maximes, and laid them up
with the Articles of Faith, which always had the first place in my
Belief, I judg'd that I might freely undertake to expell all the rest of
my opinions. And forasmuch as I did hope to bring it the better to passe
by conversing with men, then by staying any longer in my stove, where I
had had all these thoughts: before the Winter was fully ended, I
returned to my travels; and in all the nine following yeers I did
nothing but rowl here and there about the world, endeavouring rather to
be a spectator, then an actor in all those Comedies which were acted
therein: and reflecting particularly on every subject which might render
it suspected, or afford any occasion mistake. In the mean time I rooted
out of my minde all those errours which formerly had crept in. Not that
I therein imitated the Scepticks, who doubt onely to the end they may
doubt, and affect to be always unresolved: For on the contrary, all my
designe tended onely to fix my self, and to avoid quick-mires and sands,
that I might finde rock and clay: which (me thought) succeeded well
enough; forasmuch as, seeking to discover the falshood or uncertainty of
those propositions I examined, (not by weak conjectures, but by clear
and certain ratiocinations) I met with none so doubtfull, but I thence
drew some conclusion certain enough, were it but onely this, That it
contained nothing that was certain. And as in pulling down an old house,
commonly those materials are reserved which may serve to build a new
one; so in destroying all those my opinions which I judg'd ill grounded,
I made divers observations, and got severall experiences which served me
since to establish more certain ones. And besides I continued to
exercise my self in the Method I had prescribed.

For I was not only carefull to direct all my thoughts in generall
according to its rules, but I from time to time reserv'd some houres,
which I particularly employd to practice it in difficulties belonging to
the Mathematicks, loosening from all the principles of other Sciences,
which I found not stable enough, as you may see I have done in divers
explain'd in my other following discourses. And thus not living in
appearance otherwise then those who having no other business then to
lead a sweet and innocent life, study to separate pleasures from vices,
and use honest recreations to enjoy their ease without wearinesse; I did
not forbear to pursue my design, and advance in the knowledg of truth,
perhaps more, then if I had done nothing but read books or frequent
learned men.

Yet these nine years were vanished, before I had engaged my self in
those difficulties which use to be disputed amongst the learned; or
begun to seek the grounds of any more certain Philosophy then the
Vulgar: And the example of divers excellent Men who formerly having had
the same designe, seem'd not to me to have succeeded therein, made me
imagine so much difficulty, that I had not perhaps dar'd so quickly to
have undertaken it, had I not perceiv'd that some already had given it
out that I had already accomplished it. I know not whereupon they
grounded this opinion, and if I have contributed any thing thereto by my
discourse, it must have been by confessing more ingeniously what I was
ignorant of, then those are wont to do who have a little studyed, and
perhaps also by comunicating those reasons, I had to doubt of many
things which others esteem'd most eminent, rather then that I bragg'd of
any learning. But having integrity enough, not to desire to be taken for
what I was not, I thought that I ought to endeavour by all means to
render my self worthy of the reputation which was given me. And 'tis now
eight years since this desire made me resolve to estrange my self from
all places where I might have any acquaintance, and so retire my self
hither in a Country where the long continuance of the warre hath
established such orders, that the Armies which are intertain'd there,
seem to serve onely to make the inhabitants enjoy the fruits of peace
with so much the more security; and where amongst the croud of a great
people more active and solicitous for their own affaires, then curious
of other mens, not wanting any of those necessaries which are in the
most frequented Towns, I could live as solitary and retired as in the
most remote deserts.




Part. IIII.


I Know not whether I ought to entertain you with the first Meditations
which I had there, for they are so Metaphysicall and so little common,
that perhaps they will not be relished by all men: And yet that you may
judge whether the foundations I have laid are firm enough, I find my
self in a manner oblig'd to discourse them; I had long since observed
that as for manners, it was somtimes necessary to follow those opinions
which we know to be very uncertain, as much as if they were indubitable,
as is beforesaid: But because that then I desired onely to intend the
search of truth, I thought I ought to doe the contrary, and reject as
absolutely false all wherein I could imagine the least doubt, to the end
I might see if afterwards any thing might remain in my belief, not at
all subject to doubt. Thus because our senses sometimes deceive us, I
would suppose that there was nothing which was such as they represented
it to us. And because there are men who mistake themselves in reasoning,
even in the most simple matters of Geometry, and make therein
Paralogismes, judging that I was as subject to fail as any other Man, I
rejected as false all those reasons, which I had before taken for
Demonstrations. And considering, that the same thoughts which we have
waking, may also happen to us sleeping, when as not any one of them is
true. I resolv'd to faign, that all those things which ever entred into
my Minde, were no more true, then the illusions of my dreams. But
presently after I observ'd, that whilst I would think that all was
false, it must necessarily follow, that I who thought it, must be
something. And perceiving that this Truth, _I think_, therefore, _I am_,
was so firm and certain, that all the most extravagant suppositions of
the Scepticks was not able to shake it, I judg'd that I might receive it
without scruple for the first principle of the Philosophy I sought.

Examining carefully afterwards what I was; and seeing that I could
suppose that I had no _body_, and that there was no _World_, nor any
_place_ where I was: but for all this, I could not feign that I _was
not_; and that even contrary thereto, thinking to doubt the truth of
other things, it most evidently and certainly followed, That _I was_:
whereas, if I had ceas'd to _think_, although all the rest of what-ever
I had imagined were true, I had no reason to beleeve that _I had been_.
I knew then that I was a substance, whose whole essence or nature is,
but to _think_, and who to _be_, hath need of no place, nor depends on
any materiall thing. So that this _Me_, to wit, my Soul, by which I am
what I am, is wholly distinct from the Body, and more easie to be known
then _it_; and although _that_ were not, it would not therefore cease to
be what it is.

After this I considered in generall what is requisite in a Proposition
to make it true and certain: for since I had found out one which I knew
to be so, I thought I ought also to consider wherein that certainty
consisted: and having observed, That there is nothing at all in this, _I
think_, therefore _I am_, which assures me that I speak the truth,
except this, that I see most cleerly, That _to think_, one must have a
_being_; I judg'd that I might take for a generall rule, That those
things which we conceive cleerly and distinctly, are all true; and that
the onely difficulty is punctually to observe what those are which we
distinctly conceive.

In pursuance whereof, reflecting on what I doubted, and that
consequently my _being_ was not perfect; for I clearly perceived, that
it was a greater perfection to know, then to doubt, I advised in my
self to seek from whence I had learnt to think on something which was
more perfect then I; and I knew evidently that it must be of some nature
which was indeed more perfect. As for what concerns the thoughts I had
of divers other things without my self, as of heaven, earth, light,
heat, and a thousand more, I was not so much troubled to know whence
they came, for that I observed nothing in them which seemed to render
them superiour to me; I might beleeve, that if they were true, they were
dependancies from my nature, as far forth as it had any perfection; and
if they were not, I made no accompt of them; that is to say, That they
were in me, because I had something deficient. But it could not be the
same with the _Idea_ of a being more perfect then mine: For to esteem of
it as of nothing, was a thing manifestly impossible. And because there
is no lesse repugnancy that the more perfect should succeed from and
depend upon the less perfect, then for something to proceed from
nothing, I could no more hold it from my self: So as it followed, that
it must have bin put into me by a Nature which was truly more perfect
then _I_, and even which had in it all the perfections whereof I could
have an _Idea_; to wit, (to explain my self in one word) God. Whereto I
added, that since I knew some perfections which I had not, I was not the
onely _Being_ which had an existence, (I shall, under favour, use here
freely the terms of the Schools) but that of necessity there must be
some other more perfect whereon I depended, and from whom I had gotten
all what I had: For had I been alone, and depending upon no other thing,
so that I had had of my self all that little which I participated of a
perfect Being, I might have had by the same reason from my self, all the
remainder which I knew I wanted, and so have been my self infinite,
eternall, immutable, all-knowing, almighty; and lastly, have had all
those perfections which I have observed to be in God. For according to
the way of reasoning I have now followed, to know the nature of God, as
far as mine own was capable of it, I was onely to consider of those
things of which I found an _Idea_ in me, whether the possessing of them
were a perfection or no; and I was sure, that any of those which had any
imperfections were not in him, but that all others were. I saw that
doubtfulness, inconstancy, sorrow and the like, could not be in him,
seeing I could my self have wish'd to have been exempted from them.
Besides this, I had the _Ideas_ of divers sensible and corporeall
things; for although I supposed that I doted, and that all that I saw or
imagined was false; yet could I not deny but that these _Ideas_ were
truly in my thoughts. But because I had most evidently known in my self,
That the understanding Nature is distinct from the corporeall,
considering that all composition witnesseth a dependency, and that
dependency is manifestly a defect, I thence judged that it could not be
a perfection in God to be composed of those two Natures; and that by
consequence he was not so composed. But that if there were any Bodies in
the world, or els any intelligences, or other Natures which were not
wholly perfect, their being must depend from his power in such a manner,
that they could not subsist one moment without him.

Thence I went in search of other Truths; and having proposed _Geometry_
for my object, which I conceived as a continued Body, or a space
indefinitely spred in length, bredth, height or depth, divisible into
divers parts, which might take severall figures and bignesses, and be
moved and transposed every way. For the Geometricians suppose all this
in their object. I past through some of their most simple
demonstrations; and having observed that this great certaintie, which
all the world grants them, is founded only on this, that men evidently
conceived them, following the rule I already mentioned. I observed also
that there was nothing at all in them which ascertain'd me of the
existence of their object. As for example, I well perceive, that
supposing a Triangle, three angles necessarily must be equall to two
right ones: but yet nevertheless I saw nothing which assured me that
there was a Triangle in the world. Whereas returning to examine the
_Idea_ which I had of a perfect Being, _I_ found its existence comprised
in it, in the same manner as it was comprised in that of a Triangle,
where the three angles are equall to two right ones; or in that of a
sphere, where all the parts are equally distant from the center. Or even
yet more evidently, and that by consequence, it is at least as certain
that God, who is that perfect Being, is, or exists, as any demonstration
in Geometry can be.

But that which makes many perswade themselves that there is difficulty
in knowing it, as also to know what their Soul is, 'tis that they never
raise their thoughts beyond sensible things, and that they are so
accustomed to consider nothing but by imagination, which is a particular
manner of thinking on materiall things, that whatsoever is not
imaginable seems to them not intelligible. Which is manifest enough from
this, that even the Philosophers hold for a Maxime in the Schools, That
there is nothing in the understanding which was not first in the sense;
where notwithstanding its certain, that the _Ideas_ of God and of the
Soul never were. And (me thinks) those who use their imagination to
comprehend them, are just as those, who to hear sounds, or smell odours,
would make use of their eys; save that there is yet this difference,
That the sense of seeing assures us no lesse of the truth of its
objects, then those of smelling or hearing do: whereas neither our
imagination, nor our senses, can ever assure us of any thing, if our
understanding intervenes not.

To be short, if there remain any who are not enough perswaded of the
existence of God, and of their soul, from the reasons I have produc'd, I
would have them know, that all other things, whereof perhaps they think
themselves more assured, as to have a body, and that there are Stars,
and an earth, and the like, are less certain. For although we had such a
morall assurance of these things, that without being extravagant we
could not doubt of them. However, unless we be unreasonable when a
metaphysicall certainty is in question, we cannot deny but we have cause
enough not to be wholly confirmed in them, when we consider that in the
same manner we may imagine being asleep, we have other bodies, and that
we see other Stars, and another earth, though there be no such thing.
For how doe we know that those thoughts which we have in our dreams,
are rather false then the others, seeing often they are no less lively
and significant, and let the ablest men study it as long as they please,
I beleeve they can give no sufficient reason to remove this doubt,
unless they presuppose the existence of God. For first of all, that
which I even now took for a rule, to wit, that those things which were
most clearly and distinctly conceived, are all true, is certain, only by
reason, that God is or exists, and that he is a perfect being, and that
all which we have comes from him. Whence it follows, that our Idea's or
notions, being reall things, and which come from God in all wherein they
are clear and distinct, cannot therein be but true. So that if we have
very often any which contain falshood, they cannot be but of such things
which are somewhat confus'd and obscure, because that therein they
signifie nothing to us, that's to say, that they are thus confus'd in us
only, because we are not wholly perfect. And it's evident that there is
no less contrariety that falshood and imperfection should proceed from
God, as such, then there is in this, that truth and falshood proceed
from nothing. But if we know not that whatsoever was true and reall in
us comes from a perfect and infinite being, how clear and distinct
soever our Idea's were, we should have no reason to assure us, that they
had the perfection to be true.

Now after that the knowledge of God, and of the Soul hath rendred us
thus certain of this rule, it's easie to know; that the extravaganceys
which we imagin in our sleep, ought no way to make us doubt of the truth
of those thoughts which we have being awake: For if it should happen,
that even sleeping we should have a very distinct Idea; as for example,
A Geometritian should invent some new demonstration, his sleeping would
not hinder it to be true. And for the most ordinary error of our
dreames, which consists in that they represent unto us severall objects
in the same manner as our exterior senses doe, it matters not though it
give us occasion to mistrust the truth of those Ideas, because that they
may also often enough cozen us when we doe not sleep; As when to those
who have the Jaundies, all they see seems yellow; or, as the Stars or
other bodies at a distance, appear much less then they are. For in fine,
whether we sleep or wake, we ought never to suffer our selves to be
perswaded but by the evidence of our Reason; I say, (which is
observable) Of our Reason, and not of our imagination, or of our senses.
As although we see the Sun most clearly, we are not therefore to judge
him to be of the bigness we see him of; and we may well distinctly
imagine the head of a Lion, set on the body of a Goat, but therefore we
ought not to conclude that there is a _Chimera_ in the world. For reason
doth not dictate to us, that what we see or imagine so, is true: But it
dictates, that all our Idea's or notions ought to have some grounds of
truth; For it were not possible, that God who is all perfect, and all
truth, should have put them in us without that: And because that our
reasonings are never so evident, nor so entire while we sleep, as when
we wake, although sometimes our imaginations be then as much or more
lively and express. It also dictates to us, that our thoughts, seeing
they cannot be all true by reason that we are not wholly perfect; what
they have of truth, ought infallibly to occur in those which we have
being awake, rather then in our dreams.




Part. V.


I should be glad to pursue this Discourse, and shew you the whole Series
of the following Truths, which I have drawn from the former: But because
for this purpose, it were now necessary for me to treat of severall
questions, which are controverted by the learned, with whom I have no
desire to imbroil my self, I beleeve it better for me to abstain from
it; and so in generall onely to discover what they are, that I may leave
the wisest to judge whether it were profitable to inform the publick
more particularly of them. I alwayes remained constant to my resolution,
to suppose no other Principle but that which I now made use of, for the
demonstration of the Existence of God, and of the Soul; and to receive
nothing for true, which did not seem to me more clear and more certain
then the demonstrations of Geometry had formerly done. And yet I dare
say, that I have not onely found out the means to satisfie my self, in a
short time, concerning all the principall difficulties which are usually
treated in Philosophy. But that also _I_ have observed certain Laws
which God hath so established in Nature, and of which he hath imprinted
such notions in our Souls, that when we shall have made sufficient
reflections upon them we cannot doubt but that they are exactly observed
in whatsoever either is, or is done in the World. Then considering the
connexion of these Laws, me thinks, I have discovercd divers Truths,
more usefull and important then whatever _I_ learn'd before, or ever
hop'd to learn.

But because _I_ have endeavoured to lay open the principall of them in a
Treatise, which some considerations hinder me from publishing; _I_ can
no way better make them known, then by relating summarily what it
contains.

I had a designe to comprehend all what I thought _I_ knew, before _I_
would write it, touching the nature of material things. But even as
Painters, not being able equally well to represent upon a _flat_ all the
severall facies of a solid body, chuse the principall of them, which
they place towards the light; and shadowing the others, make them appear
no more then they do to our sight: So, fearing lest _I_ should not bring
into this Discourse all which was in my thoughts, _I_ onely undertook to
set forth at large my conceptions touching the light; and upon that
occasion to add somewhat of the Sun, and of the fix'd Stars, by reason
that it proceeds almost all from thence; of the Heavens, because they
transmit it; of the Planets, of the Comets, and of the Earth, because
they cause it to reflect; and in particular, of all Bodies which are on
the earth, whether for that they are either coloured, or transparent, or
luminous; and last of all, of Man, because he is the Spectator thereof.
As also, in some manner to shadow out all these things, and that _I_
might the more freely speak what _I_ judg'd, without being obliged to
follow, or to refute the opinions which are received amongst the
Learned, _I_ resolved to leave all this world here to their disputes,
and to speak onely of what would happen in a new one, if God now created
some where in those imaginary spaces matter enough to compose it, and
that he diversly and without order agitated the severall parts of this
matter, so as to compose a Chaos of it as confused as the Poets could
feign one: and that afterwards he did nothing but lend his ordinary
concurrence to Nature, and leave her to work according to the Laws he
hath established.

Thus first of all _I_ described this Matter, and endevoured to
represent it such, that me thinks there is nothing in the world more
clear, or more intelligible, except what was beforesaid of God, and of
the Soul. For even _I_ expresly supposed that there was in it none of
those forms and qualities which are disputed in the Schools; nor
generally any thing but that the knowledge thereof was so naturall to
our understandings, that we could not even feigne to be ignorant of it.
Besides, I made known what the Laws of Nature were; and without
grounding my reasons on any other principles, but on the infinite
perfections of God, I did endeavour to demonstrate all those which might
be questioned, and to make them appear to be such, that although God had
created divers worlds, there could have been none where they were not
observed. Afterwards _I_ shewed how the greater part of the Matter of
this _Chaos_ ought, according to those Laws, to dispose and order it
self in a certain manner, which would make it like our Heavens: And how
some of these parts were to compose an Earth, and some Planets and
Commets, some others a Sun and fix'd Starrs. And here enlarging my self
on the subject of Light, _I_ at length explain'd what that light was,
which was to be in the Sun and Stars; and thence how it travers'd in an
instant the immense spaces of the Heavens, and how it reflected it self
from Planets and Commets towards the Earth. _I_ added also divers things
touching the substance, situation, the motions, and all the several
qualities of these heavens and these stars: So that _I_ thought _I_ had
said enough to make known, That there is nothing remarkable in those of
this world, which ought not, or at least could not appear altogether
like to these of that world which _I_ described.

Thence _I_ came to speak particularly of the Earth; how, although I had
expresly supposed, that God had placed no weight in the Matter whereof
it was composed; yet all its parts exactly tended towards its center:
How that there being water and air upon its superficies, the disposition
of the Heavens, and of the Starrs, and chiefly of the Moon, ought to
cause a floud and an ebb, which in all circumstances was like to that
which we observe in our Seas; And besides, a certain course aswel of the
water, as of the air, from East to West, as is also observed between the
Tropicks: How the Mountains, the Seas, the Springs and Rivers might
naturally be form'd therein, and Metals run in the mines, and Plants
grow in the Fields, and generally all bodies be therein engendered which
are call'd mixt or composed.

And amongst other things, because that next the Stars, I know nothing in
the world but Fire, which produceth light, I studied to make all clearly
understood which belongs to its nature; how it's made, how it's fed,
how sometimes it hath heat onely without light, and sometimes onely
light without heat; how it can introduce several colours into several
bodies, and divers other qualities; how it dissolves some, and hardens
others; how it can consume almost all, or convert them into ashes and
smoak: and last of all, how of those ashes, by the only violence of its
action, it forms glass. For this transmutation of ashes into glass,
seeming to me to be as admirable as any other operation in Nature, I
particularly took pleasure to describe it.

Yet would I not inferre from all these things, that this World was
created after the manner I had proposed. For it is more probable that
God made it such as it was to be, from the beginning. But it's certain,
and 'tis an opinion commonly received amongst the Divines, That the
action whereby he now preserveth it, is the same with that by which he
created it. So that, although at the beginning he had given it no other
form but that of a Chaos (provided, that having established the Laws of
Nature, he had afforded his concurrence to it, to work as it used to do)
we may beleeve (without doing wrong to the miracle of the Creation) that
by that alone all things which are purely material might in time have
rendred themselves such as we now see them: and their nature is far
easier to conceive, when by little and little we see them brought forth
so, then when we consider them quite form'd all at once.

From the description of inanimate Bodies and Plants, I pass'd to that of
Animals, and particularly to that of Men. But because I had not yet
knowledge enough to speak of them in the same stile as of the others; to
wit, in demonstrating effects by their causes, and shewing from what
seeds, and in what manner Nature ought to produce them; I contented my
self to suppose, That God form'd the body of a Man altogether like one
of ours; aswel the exteriour figure of its members, as in the interiour
conformity of its organs; without framing it of other matter then of
that which I had described; and without putting in it at the beginning
any reasonable soul, or any other thing to serve therein for a
vegetative or sensitive soul; unless he stirr'd up in his heart one of
those fires without light which I had already discovered; and that I
conceiv'd of no other nature but that which heats hay when its housed
before it be dry, or which causes new Wines to boyl when it works upon
the grape: For examining the functions which might be consequently in
this body, I exactly found all those which may be in us, without our
thinking of them; and to which our soul (that is to say, that distinct
part from our bodies, whose nature (as hath been said before) is onely
to think) consequently doth not contribute, and which are all the same
wherein we may say unreasonable creatures resemble us. Yet could I not
finde any, of those which depending from the thought, are the onely ones
which belong unto us as Men; whereas I found them all afterwards, having
supposed that God created a reasonable soul, and that he joyn'd it to
this body, after a certain manner which I describ'd.

But that you might see how I treated this matter, I shall here present
you with the explication of the motion of the heart, and of the
arteries, which being the first and most general (which is observed in
animals) we may thereby easily judge what we ought to think of all the
rest. And that we may have the less difficulty to understand what I
shall say thereof, I wish those who are not versed in Anatomy, would
take the pains, before they read this, to cause the heart of some great
animal which hath lungs, to be dissected; for in all of them its very
like that of a Man: and that they may have shewn them the two cels or
concavities which are there: First that on the right side, whereto two
large conduits answer, to wit, the _vena cava_, which is the principal
receptacle of bloud, and as the body of a tree, whereof all the other
veins of the body are branches; and the arterious vein, which was so
mis-call'd, because that in effect its an artery, which taking its
_origine_ from the heart, divides it self after being come forth, into
divers branches, which every way spred themselves through the lungs.
Then the other which is on the left side, whereunto in the same manner
two pipes answer, which are as large, or larger then the former; to wit,
the veinous artery, which was also il named, forasmuch as its nothing
else but a vein which comes from the lungs, where its divided into
several branches interlaid with those of the arterious vein, and those
of that pipe which is called the Whistle, by which the breath enters.
And the great artery, which proceeding from the heart, disperseth its
branches thorow all the body. I would also that they would carefully
observe the eleven little skins, which, as so many little doors, open
and shut the four openings which are in these two concavities; to wit,
three at the entry of the _vena cava_, where they are so disposed, that
they can no wayes hinder the bloud which it contains from running into
the right concavity of the heart; and yet altogether hinder it from
coming out. Three at the entry of the arterious vein; which being
disposed quite contrary, permit only the bloud which is in that
concavity to pass to the lungs; but not that which is in the lungs to
return thither. And then two others at the entry of the veinous artery,
which permits the bloud to run to the left concavity of the heart, but
opposeth its return. And three at the entry of the great artery, which
permit it to go from the heart, but hinder its return thither. Neither
need we seek any other reason for the number of these skins, save only
that the opening of the veinous artery, being oval-wise, by reason of
its situation, may be fitly shut with two; whereas the other, being
round, may the better be clos'd with three. Besides, I would have them
consider, that the great artery and the arterious vein are of a
composition much stronger then the veinous artery or the _vena cava_.
And that these two later grow larger before they enter into the heart,
and make (as it were) two purses, call'd the ears of the heart, which
are composed of a flesh like it; and that there is always more heat in
the heart then in any other part of the body. And in fine, that if any
drop of bloud enter into these concavities, this heat is able to make it
presently swell and dilate it self, as generally all liquors do, when
drop by drop we let them fall into a very hot vessel.

For after this I need say no more for to unfold the motion of the
heart, but that when these concavities are not full of bloud,
necessarily there runs some from the _vena cava_ into the right, and
from the veinous artery into the left; for that these two vessels are
always full of it, and that their openings which are towards the heart
cannot then be shut: But that assoon as there is thus but two drops of
bloud entred, one in either of these concavities, these drops, which
cannot but be very big, by reason that their openings whereby they enter
are very large, and the vessels whence they come very full of bloud, are
rarified and dilated because of the heat which they find therein. By
means whereof, causing all the heart to swel, they drive and shut the
five little doors which are at the entry of the two vessels whence they
come, hindering thereby any more bloud to fall down into the heart, and
continuing more and more to rarifie themselves, they drive and open the
six other little doors which are at the entry of the other two vessels
whence they issue, causing by that means all the branches of the
arterious vein, and of the great artery, to swel (as it were) at the
same time with the heart: which presently after fals, as those arteries
also do, by reason that the bloud which is entred therein grows colder,
and their six little doors shut up again, and those five of the _vena
cava_, and of the veinous artery open again, and give way to two other
drops of bloud, which again swell the heart and the arteries in the same
manner as the preceding did. And because the bloud which thus enters
into the heart, passeth thorow those two purses, which are call'd the
ears; thence it comes, that their motion is contrary to the heart's, and
that they fall when that swels.

Lastly, That they who know not the force of Mathematical demonstrations,
and are not accustomed to distinguish true reasons from probable ones,
may not venture to deny this without examining it, I shall advertise
them, that this motion which I have now discovered, as necessarily
follows from the onely disposition of the organs (which may plainly be
seen in the heart,) and from the heat (which we may feel with our
fingers,) and from the nature of the bloud (which we may know by
experience,) as the motions of a clock doth by the force, situation and
figure of its weight and wheels.

But if it be asked, how it comes that the bloud of the veins is not
exhausted, running so continually into the heart; and how that the
arteries are not too full, since all that which passeth thorow the heart
dischargeth it self into them: I need answer nothing thereto but what
hath been already writ by an English Physician, to whom this praise must
be given, to have broken the ice in this place, and to be the first who
taught us, That there are several little passages in the extremity of
the arteries whereby the bloud which they receive from the heart,
enters the little branches of the veins; whence again it sends it self
back towards the heart: so that its course is no other thing but a
perpetuall circulation. Which he very wel proves by the ordinary
experience of Chirurgians, who having bound the arm indifferently hard
above the the place where they open the vein, which causeth the bloud to
issue more abundantly, then if it had not been bound. And the contrary
would happen, were it bound underneath, between the hand and the
incision, or bound very hard above. For its manifest, that the band
indifferently tyed, being able to hinder the bloud which is already in
the arm to return towards the heart by the veins; yet it therefore
hinders not the new from coming always by the arteries, by reason they
are placed under the veins, and that their skin being thicker, are less
easie to be press'd, as also that the bloud which comes from the heart,
seeks more forcibly to passe by them towards the hand, then it doth to
return from thence towards the heart by the veins. And since this bloud
which issues from the arm by the incision made in one of the veins, must
necessarily have some passage under the bond, to wit, towards the
extremities of the arm, whereby it may come thither by the arteries, he
also proves very well what he sayes of the course of the bloud through
certain little skins, which are so disposed in divers places along the
veins, which permit it not to pass from the middle towards the
extremities, but onely to return from the extremities towards the heart.
And besides this, experience shews, That all the bloud which is in the
body may in a very little time run out by one onely artery's being cut,
although it were even bound very neer the heart, and cut betwixt it and
the ligature: So that we could have no reason to imagine that the bloud
which issued thence could come from any other part.

But there are divers other things which witness, that the true cause of
this motion of the bloud is that which I have related. As first, The
difference observed between that which issues out of the veins, and that
which comes out of the arteries, cannot proceed but from its being
rarified and (as it were) distilled by passing thorow the heart: its
more subtil, more lively, and more hot presently after it comes out;
that is to say, being in the arteries, then it is a little before it
enters them, that is to say, in the veins. And if you observe, you will
finde, that this difference appears not well but about the heart; and
not so much in those places which are farther off. Next, the hardnesse
of the skin of which the artery vein and the great artery are composed,
sheweth sufficiently, that the bloud beats against them more forcibly
then against the veins. And why should the left concavity of the heart,
and the great artery be more large and ample then the right concavity,
and the arterious vein; unless it were that the bloud of the veinous
artery, having bin but onely in the lungs since its passage thorow the
heart, is more subtil, and is rarified with more force and ease then the
bloud which immediately comes from the _vena cava_. And what can the
Physicians divine by feeling of the pulse, unlesse they know, that
according as the bloud changeth its nature, it may by the heat of the
heart be rarified to be more or lesse strong, and more or lesse quick
then before. And if we examine how this heat is communicated to the
other members, must we not avow that 'tis by means of the bloud, which
passing the heart, reheats it self there, and thence disperseth it self
thorow the whole body: whence it happens, that if you take away the
bloud from any part, the heat by the same means also is taken a way. And
although the heart were as burning as hot iron, it were not sufficient
to warm the feet and the hands so often as it doth, did it not continue
to furnish them with new bloud.

Besides, from thence we know also that the true use of respiration is to
bring fresh air enough to the lungs, to cause that bloud which comes
from the right concavity of the heart, where it was rarified, and (as it
were) chang'd into vapours, there to thicken, and convert it self into
bloud again, before it fall again into the left, without which it would
not be fit to serve for the nourishment of the fire which is there.
Which is confirm'd, for that its seen, that animals which have no lungs
have but one onely concavity in the heart; and that children, who can
make no use of them when they are in their mothers bellies, have an
opening, by which the bloud of the _vena cava_ runs to the left
concavity of the heart, and a conduit by which it comes from the
arterious vein into the great artery without passing the lungs.

Next, How would the concoction be made in the stomach, unlesse the heart
sent heat by the arteries, and therewithall some of the most fluid parts
of the bloud, which help to dissolve the meat receiv'd therein? and is
not the act which converts the juice of these meats into bloud easie to
be known, if we consider, that it is distill'd by passing and repassing
the heart, perhaps more then one or two hundred times a day? And what
need we ought else to explain the nutrition and the production of divers
humours which are in the body, but to say, that the force wherewith the
bloud in rarifying it self, passeth from the heart towards the
extremities or the arteries, causeth some of its parts to stay amongst
those of the members where they are, and there take the place of some
others, which they drive from thence? And that according to the
situation, or the figure, or the smalnesse of the pores which they
meet, some arrive sooner in one place then others. In the same manner
as we may have seen in severall sieves, which being diversly pierc'd,
serve to sever divers grains one from the other. And briefly, that which
is most remarkable herein, is the generation of the animal spirits,
which are as a most subtil wind, or rather, as a most pure and lively
flame, which continually rising in great abundance from the heart to the
brain, dischargeth it self thence by the nerves into the muscles, and
gives motion to all the members; without imagining any other reason
which might cause these parts of the bloud, which being most mov'd, and
the most penetrating, are the most fit to form these spirits, tend
rather towards the brain, then to any other part. Save onely that the
arteries which carry them thither, are those which come from the heart
in the most direct line of all: And that according to the rules of the
Mechanicks, which are the same with those of Nature, when divers things
together strive to move one way, where there is not room enough for all;
so those parts of bloud which issue from the left concavity of the heart
tend towards the brain, the weaker and less agitated are expell'd by the
stronger, who by that means arrive there alone.

I had particularly enough expounded all these things in a Treatise which
I formerly had design'd to publish: In pursuit whereof, I had therein
shewed what ought to be the fabrick of the nerves and muscles of an
humane body, to cause those animall spirits which were in them, to have
the power to move those members. As we see that heads a while after they
are cut off, yet move of themselves, and bite the ground, although they
are not then animated. What changes ought to be made in the brain to
cause waking, sleeping, and dreaming: how light, sounds, smels, tasts,
heat, and all other qualities of exteriour objects, might imprint
severall _Ideas_ by means of the senses. How hunger and thirst, and the
other interiour passions might also send theirs thither. What ought to
be taken therein for common sense, where these _Ideas_ are received; for
memory which preserves them; and for fancy, which can diversly change
them, and form new ones of them; and by the same means, distributing the
animal spirits into the muscles, make the members of the body move in so
many severall fashions, and as fitly to those objects which present
themselves to its senses; and to the interiour passions which are in
them, as ours may move themselves without the consent of the Wil. Which
wil seem nothing strange to those, who knowing how many _Automatas_ or
moving Machines the industry of men can make, imploying but very few
pieces, in comparison of the great abundance of bones, muscles, nerves,
arteries, veins, and all the other parts which are in the body of every
Animal, will consider this body as a fabrick, which having been made by
the hands of God, is incomparably better ordered, and hath more
admirable motions in it then any of those which can be invented by men.
And herein I particularly insisted, to make it appear, that if there
were such Machines which had organs, and the exteriour figure of an Ape,
or of any other unreasonable creature, we should finde no means of
knowing them not to be altogether of the same nature as those Animals:
whereas, if there were any which resembled our bodies, and imitated our
actions as much as morally it were possible, we should always have two
most certain ways to know, that for all that they were not reall men:
The first of which is, that they could never have the use of speech, nor
of other signes in framing it, as we have, to declare our thoughts to
others: for we may well conceive, that a Machine may be so made, that it
may utter words, and even some proper to the corporal actions, which
may cause some change in its organs; as if we touch it in some part, and
it should ask what we would say; or so as it might cry out that one
hurts it, and the like: but not that they can diversifie them to answer
sensibly to all what shall be spoken in its presence, as the dullest men
may do. And the second is, That although they did divers things aswel,
or perhaps better, then any of us, they must infallibly fail in some
others, whereby we might discover that they act not with knowledge, but
onely by the disposition of their organs: for whereas Reason is an
universal instrument which may serve in all kinde of encounters, these
organs have need of some particular disposition for every particular
action: whence it is, that its morally impossible for one Machine to
have severall organs enough to make it move in all the occurrences of
this life, in the same manner as our Reason makes us move. Now by these
two means we may also know the difference which is between Men and
Beasts: For 'tis a very remarkable thing, that there are no men so dull
and so stupid, without excepting those who are out of their wits, but
are capable to rank severall words together, and of them to compose a
Discourse, by which they make known their thoughts: and that on the
contrary, there is no other creature, how perfect or happily soever
brought forth, which can do the like. The which happens, not because
they want organs; for we know, that Pyes and Parrots can utter words
even as we can, and yet cannot speak like us; that is to say, with
evidence that they think what they say. Whereas Men, being born deaf and
dumb, and deprived of those organs which seem to make others speak, as
much or more then beasts, usually invent of themselves to be understood
by those, who commonly being with them, have the leisure to learn their
expressions. And this not onely witnesseth, that Beasts have lesse
reason than men, but that they have none at all. For we see there needs
not much to learn to speak: and forasmuch as we observe inequality
amongst Beasts of the same kind, aswell as amongst men, and that some
are more easily managed then others; 'tis not to be believed, but that
an Ape or a Parrot which were the most perfect of its kinde, should
therein equall the most stupid child, or at least a child of a
distracted brain, if their souls were not of a nature wholly different
from ours. And we ought not to confound words with naturall motions,
which witness passions, and may be imitated by Machines aswell as by
Animals; nor think (as some of the Ancients) that beasts speak, although
we do not understand their language: for if it were true, since they
have divers organs which relate to ours, they could aswell make
themselves understood by us, as by their like. Its likewise very
remarkable that although there are divers creatures which express more
industry then we in some one of their actions; yet we may well perceive,
that the same shew none at all in many others: So that what they do
better then we, proves not at all that they have reason; for by that
reckoning they would have more then any of us, and would do better in
all other things; but rather, that they have none at all, and that its
Nature onely which works in them according to the disposition of their
organs. As wee see a Clock, which is onely composed of wheels and
springs, can reckon the hours, and measure the times more exactly then
we can with all our prudence.

After this I had described the reasonable Soul, and made it appear, that
it could no way be drawn from the power of the Matter, as other things
whereof I had spoken; but that it ought to have been expresly created:
And how it suffiseth not for it to be lodg'd in our humane body as a
Pilot in his ship, to move its members onely; but also that its
necessary it be joyned and united more strongly therewith to have
thoughts and appetites like ours, and so make a reall man.

I have here dilated my self a little on the subject of the Soul, by
reason 'tis of most importance; for, next the errour of those who deny
God, which I think I have already sufficiently confuted, there is none
which sooner estrangeth feeble minds from the right way of vertue, then
to imagine that the soul of beasts is of the same nature as ours, and
that consequently we have nothing to fear nor hope after this life, no
more then flies or ants. Whereas, when we know how different they are,
we comprehend much better the reasons which prove that ours is of a
nature wholly independing from the body, and consequently that it is not
subject to die with it. And that when we see no other cause which
destroys it, we are naturally thence moved to judge that it's immortall.




PART. VI.


Its now three years since I ended the Treatise which contains all these
things, and that I began to review it, to send it afterwards to the
Presse, when I understood, that persons to whom I submit, and whose
authority can no lesse command my actions, then my own Reason doth my
thoughts, had disapproved an opinion in Physicks, published a little
before by another; of which I will not say that I was, but that indeed I
had observed nothing therein, before their censure, which I could have
imagined prejudiciall either to Religion or the State; or consequently,
which might have hindred me from writing the same, had my Reason
perswaded mee thereto. And this made me fear, lest in the same manner
there might be found some one amongst mine, in which I might have been
mistaken; notwithstanding the great care I always had to admit no new
ones into my belief, of which I had not most certain demonstrations; and
not to write such as might turn to the disadvantage of any body. Which
was sufficient to oblige me to change my resolution of publishing them.
For although the reasons for which I had first of all taken it, were
very strong; yet my inclination, which alwayes made me hate the trade of
Book-making, presently found me out others enough to excuse my self from
it. And these reasons on the one and other side are such, that I am not
only somewhat concern'd to speak them; but happily the Publick also to
know them.

I never did much esteem those things which proceeded from mine own
brain; and so long as I have gathered no other fruits from the Method I
use, but onely that I have satisfied my self in some difficulties which
belong to speculative Sciences, or at least endeavoured to regulate my
Manners by the reasons it taught me, I thought my self not obliged to
write any thing of them. For, as for what concerns Manners, every one
abounds so much in his own sense, That we may finde as many Reformers as
heads, were it permitted to others, besides those whom God hath
established as Soveraigns over his people, or at least, to whom he hath
dispensed grace and zeal enough to be Prophets, to undertake the change
of any thing therein. And although my Speculations did very much please
me, I did beleeve that other men also had some, which perhaps pleas'd
them more. But as soon as I had acquired some generall notions touching
naturall Philosophy, and beginning to prove them in divers particular
difficulties, I observed how far they might lead a man, and how far
different they were from the principles which to this day are in use; I
judg'd, that I could not keep them hid without highly sinning against
the Law, which obligeth us to procure, as much as in us lies, the
general good of all men. For they made it appear to me, that it was
possible to attain to points of knowledge, which may be very profitable
for this life: and that in stead of this speculative Philosophy which is
taught in the Schools, we might finde out a practicall one, by which
knowing the force and workings of Fire, Water, Air, of the Starrs, of
the Heavens, and of all other Bodies which environ us, distinctly, as we
know the several trades of our Handicrafts, we might in the same manner
employ them to all uses to which they are fit, and so become masters and
possessours of Nature. Which is not onely to be desired for the
invention of very many expedients of Arts, which without trouble might
make us enjoy the fruits of the earth, and all the conveniences which
are to be found therein: But chiefly also for the preservation of
health, which (without doubt) is the first good, and the foundation of
all other good things in this life. For even the minde depends so much
on the temper and disposition of the organs of the body, that if it be
possible to finde any way of making men in the generall wiser, and more
able then formerly they were, I beleeve it ought to be sought in
Physick. True it is, that which is now in use contains but few things,
whose benefit is very remarkable: But (without any designe of slighting
of it) I assure my self, there is none, even of their own profession,
but will consent, that whatsoever is known therein, is almost nothing in
companion of what remains to be known. And that we might be freed from
very many diseases, aswell of the body as of the mind, and even also
perhaps from the weaknesses of old age, had we but knowledge enough of
their Causes, and of all the Remedies wherewith Nature hath furnished
us. Now having a designe to employ all my life in the enquiry of so
necessary a Science; and having found a way, the following of which me
thinks might infallibly lead us to it, unless we be hindred by the
shortness of life, or by defect of experiments. I judg'd that there was
no better Remedie against those two impediments, but faithfully to
communicate to the publique, all that little I should discover, and to
invite all good Wits to endevour to advance farther in contributing
every one, according to his inclination and power, to those Experiments
which are to be made, and communicating also to the publique all the
things they should learn; so that the last, beginning where the
precedent ended, and so joyning the lives and labors of many in one, we
might all together advance further then any particular Man could do.

I also observ'd touching Experiments, that they are still so much the
more necessary, as we are more advanc'd in knowledg. For in the
beginning it's better to use those only which of themselves are
presented to our senses, and which we cannot be ignorant of, if we do
but make the least reflections upon them, then to seek out the rarest
and most studied ones. The reason whereof is, that those which are
rarest, doe often deceive, when we seldome know the same of the most
common ones, and that the circumstances on which they depend, are, as it
were, always so particular, and so small, that it's very uneasie to
finde them out. But the order I observed herein was this. First, I
endevoured to finde in generall the Principles or first Causes of
whatsoever is or may be in the world, without considering any thing for
this end, but God alone who created it, or drawing them elsewhere, then
from certain seeds of Truth which naturally are in our souls. After
this, I examined what were the first and most ordinary Effects which
might be deduced from these Causes: And me thinks that thereby I found
out Heavens, Starrs, an Earth; and even on the Earth, Water, Air and
Fire, Minerals, and some other such like things, which are the most
common, and the most simple of all, and consequently the most easie to
be understood. Afterwards, when I would descend to those which were more
particular, there were so many severall ones presented themselves to me,
that I did beleeve it impossible for a humane understanding to
distinguish the forms and species of Bodies which are on the earth, from
an infinite number of others which might be there, had it been the will
of God so to place them: Nor by consequence to apply them to our use,
unless we set the Effects before the Causes, and make use of divers
particular experiments; In relation to which, revolving in my minde all
those objects which ever were presented to my senses, I dare boldly say,
I observed nothing which I could not fitly enough explain by the
principles I had found. But I must also confesse that the power of
Nature is so ample and vast, and these principles are so simple and
generall, that I can observe almost no particular Effect, but that I
presently know it might be deduced from thence in many severall ways:
and that commonly my greatest difficulty is to finde in which of these
ways it depends thereon; for I know no other expedient for that, but
again to seek some experiments, which may be such, that their event may
not be the same, if it be in one of those ways which is to be exprest,
as if it were in another. In fine, I am gotten so far, That (me thinks)
I see well enough what course we ought to hold to make the most part of
those experiments which may tend to this effect. But I also see they
are such, and of so great a number, that neither my hands nor my estate
(though I had a thousand times more then I have) could ever suffice for
all. So that according as I shall hereafter have conveniency to make
more or fewer of them, I shall also advance more or lesse in the
knowledge of Nature, which I hop'd I should make known by the Treatise
which I had written; and therein so clearly shew the benefit which the
Publick may receive thereby, that I should oblige all those in general
who desire the good of Mankinde; that is to say, all those who are
indeed vertuous, (and not so seemingly, or by opinion only) aswell to
communicate such experiments as they have already made, as to help me in
the enquiry of those which are to be made.

But since that time, other reasons have made me alter my opinion, and
think that I truly ought to continue to write of all those things which
I judg'd of any importance, according as I should discover the truth of
them, and take the same care, as if I were to print them; as well that I
might have so much the more occasion throughly to examine them; as
without doubt, we always look more narrowly to what we offer to the
publick view, then to what we compose onely for our own use: and
oftentimes the same things which seemed true to me when I first
conceived them, appear'd afterwards false to me, when I was committing
them to paper: as also that I might lose no occasion of benefiting the
Publick, if I were able, and that if my Writings were of any value,
those to whose hands they should come after my death, might to make what
use of them they think fit.

But that I ought not any wayes to consent that they should be published
during my life; That neither the opposition and controversies, whereto
perhaps they might be obnoxious, nor even the reputation whatsoever it
were, which they might acquire me, might give me any occasion of
mispending the time I had design'd to employ for my instruction; for
although it be true that every Man is oblig'd to procure, as much as in
him lies, the good of others; and that to be profitable to no body, is
properly to be good for nothing: Yet it's as true, that our care ought
to reach beyond the present time; and that it were good to omit those
things which might perhaps conduce to the benefit of those who are
alive, when our designe is, to doe others which shall prove farr more
advantagious to our posterity; As indeed I desire it may be known that
the little I have learnt hitherto, is almost nothing in comparison of
what I am ignorant of; and I doe not despair to be able to learn: For
it's even the same with those, who by little and little discover the
truth in Learning; as with those who beginning to grow rich, are less
troubled to make great purchases, then they were before when they were
poorer, to make little ones. Or else one may compare them to Generals of
Armies, whose Forces usually encrease porportionably to their Victories;
and who have need of more conduct to maintain themselves after the loss
of a battail, then after the gaining one, to take Towns and Provinces.
For to endeavour to overcome all the difficulties and errours which
hinder us to come to the knowledg of the Truth, is truly to fight
battails. And to receive any false opinion touching a generall or
weighty matter, is as much as to lose one; there is far more dexterity
required to recover our former condition, then to make great progresses
where our Principles are already certain. For my part, if I formerly
have discovered some Truths in Learning, as I hope my Discourse will
make it appear I have, I may say, they are but the products and
dependances of five or six principall difficulties which I have
overcome, and which I reckon for so many won Battails on my side.
Neither will I forbear to say; That I think, It's only necessary for me
to win two or three more such, wholly to perfect my design. And that I
am not so old, but according to the ordinary course of Nature, I may
have time enough to effect it. But I beleeve I am so much the more
obliged to husband the rest of my time, as I have more hopes to employ
it well; without doubt, I should have divers occasions of impeding it,
should I publish the grounds of my Physicks. For although they are
almost all so evident, that to beleeve them, it's needfull onely to
understand them; and that there is none whereof I think my self unable
to give demonstration. Yet because it's impossible that they should
agree with all the severall opinions of other men, I foresee I should
often be diverted by the opposition they would occasion.

It may be objected, These oppositions might be profitable, as well to
make me know my faults, as if any thing of mine were good to make others
by that means come to a better understanding thereof; and as many may
see more then one man, beginning from this time to make use of my
grounds, they might also help me with their invention. But although I
know my self extremely subject to fail, and do never almost trust my
first thoughts; yet the experience I have of the objections which may be
made unto me, hinder me from hoping for any profit from them; For I have
often tried the judgments as well of those whom I esteem'd my friends,
as of others whom I thought indifferent, and even also of some, whose
malignity and envie did sufficiently discover what the affection of my
friends might hide. But it seldom happened that any thing was objected
against me, which I had not altogether foreseen, unless it were very
remote from my Subject: So that I never almost met with any Censurer of
my opinions, that seemed unto me either less rigorous, or less equitable
then my self. Neither did I ever observe, that by the disputations
practiced in the Schools any Truth which was formerly unknown, was ever
discovered. For whilest every one seeks to overcome, men strive more to
maintain probabilities, then to weigh the reasons on both sides; and
those who for a long time have been good Advocates, are not therefore
the better Judges afterwards.

As for the benefit which others may receive from the communication of my
thoughts, it cannot also be very great, forasmuch as I have not yet
perfected them, but that it is necessary to add many things thereunto,
before a usefull application can be made of them. And I think I may say
without vanity, That if there be any one capable thereof, it must be my
self, rather then any other. Not but that there may be divers wits in
the world incomparably better then mine; but because men cannot so well
conceive a thing and make it their own, when they learn it of another,
as when they invent it themselves: which is so true in this Subject,
that although I have often explain'd some of my opinions to very
understanding men, and who, whilest I spake to them, seem'd very
distinctly to conceive them; yet when they repeated them, I observ'd,
that they chang'd them almost always in such a manner, that I could no
longer own them for mine. Upon which occasion, I shall gladly here
desire those who come after me, never to beleeve those things which may
be delivered to them for mine, when I have not published them my self.
And I do not at all wonder at the extravagancies which are attributed to
all those ancient Philosophers, whose Writings we have not; neither do I
thereby judge, that their thoughts were very irrationall, seeing they
were the best Wits of their time; but onely that they have been ill
convey'd to us: as it appears also, that never any of their followers
surpass'd them. And I assure my self, that the most passionate of those,
who now follow _Aristotle_, would beleeve himself happy, had he but as
much knowledge of Nature as he had, although it were on condition that
he never might have more: They are like the ivie, which seeks to climb
no higher then the trees which support it, and ever after tends
downwards again when it hath attain'd to the height thereof: for, me
thinks also, that such men sink downwards; that is to say, render
themselves in some manner lesse knowing, then if they did abstain from
studying; who being not content to know all which is intelligibly set
down in their Authour, will besides that, finde out the solution of
divers difficulties of which he says nothing, and perhaps never thought
of them: yet their way of Philosophy is very fit for those who have but
mean capacities: For the obscurity of the distinctions and principles
which they use causeth them to speak of all things as boldly, as if they
knew them, and maintain all which they say, against the most subtill and
most able; so that there is no means left to convince them. Wherein they
seem like to a blinde man, who, to fight without disadvantage against
one that sees, should challenge him down into the bottom of a very dark
cellar: And I may say, that it is these mens interest, that I should
abstain from publishing the principles of the Philosophy I use, for
being most simple and most evident, as they are, I should even do the
same in publishing of them, as if I opened some windows, to let the day
into this cellar, into which they go down to fight. But even the best
Wits have no reason to wish for the knowledge of them: for if they will
be able to speak of all things, and acquire the reputation of being
learned, they will easily attain to it by contenting themselves with
probability, which without much trouble may be found in all kinde of
matters; then in seeking the Truth, which discovers it self but by
little and little, in some few things; and which, when we are to speak
of others, oblige us freely to confesse our ignorance of them. But if
they prefer the knowledge of some few truths to the vanity of seeming to
be ignorant of nothing, as without doubt they ought to do, and will
undertake a designe like mine, I need not tell them any more for this
purpose, but what I have already said in this Discourse: For if they
have a capacity to advance farther then I have done, they may with
greater consequence finde out of themselves whatsoever I think I have
found; Forasmuch as having never examined any thing but by order, it's
certain, that what remains yet for me to discover, is in it self more
difficult and more hid, then what I have already here before met with;
and they would receive much less satisfaction in learning it from me,
then from themselves. Besides that, the habit which they would get by
seeking first of all the easie things, and passing by degrees to others
more difficult, will be more usefull to them, then all my instructions.
As I for my part am perswaded, that had I been taught from my youth all
the Truths whose demonstrations I have discovered since, and had taken
no pains to learn them, perhaps I should never have known any other, or
at least, I should never have acquired that habit, and that faculty
which I think I have, still to finde out new ones, as I apply my self to
the search of them. And in a word, if there be in the world any work
which cannot be so well ended by any other, as by the same who began it,
it's that which I am now about.

It's true, That one man will not be sufficient to make all the
experiments which may conduce thereunto: But withall, he cannot
profitably imploy other hands then his own, unlesse it be those of
Artists, or others whom he hires, and whom the hope of profit (which is
a very powerfull motive) might cause exactly to do all those things he
should appoint them: For as for voluntary persons, who by curiosity or a
desire to learn, would perhaps offer themselves to his help, besides
that commonly they promise more then they perform, and make onely fair
propositions, whereof none ever succeeds, they would infallibly be paid
by the solution of some difficulties, or at least by complements and
unprofitable entertainments, which could not cost him so little of his
time, but he would be a loser thereby. And for the Experiments which
others have already made, although they would even communicate them to
him (which those who call them Secrets would never do,) they are for
the most part composed of so many circumstances, or superfluous
ingredients, that it would be very hard for him to decypher the truth of
them: Besides, he would find them all so ill exprest, or else so false,
by reason that those who made them have laboured to make them appear
conformable to their principles; that if there were any which served
their turn, they could not at least be worth the while which must be
imployed in the choice of them. So that, if there were any in the world
that were certainly known to be capable of finding out the greatest
things, and the most profitable for the Publick which could be, and that
other men would therefore labour alwayes to assist him to accomplish his
Designes; I do not conceive that they could do more for him, then
furnish the expence of the experiments whereof he stood in need; and
besides, take care only that he may not be by any body hindred of his
time. But besides that, I do not presume so much of my Self, as to
promise any thing extraordinary, neither do I feed my self with such
vain hopes, as to imagine that the Publick should much interesse it self
in my designes; I have not so base a minde, as to accept of any favour
whatsoever, which might be thought I had not deserved.

All these considerations joyned together, were the cause three years
since why I would not divulge the Treatise I had in hand; and which is
more, that I resolved to publish none whilest I lived, which might be so
general, as that the Grounds of my Philosophy might be understood
thereby. But since, there hath been two other reasons have obliged me to
put forth some particular Essays, and to give the Publick some account
of my Actions and Designes. The first was, that if I failed therein,
divers who knew the intention I formerly had to print some of my
Writings, might imagine that the causes for which I forbore it, might
be more to my disadvantage then they are. For although I do not affect
glory in excess; or even, (if I may so speak) that I hate it, as far as
I judge it contrary to my rest, which I esteem above all things: Yet
also did I never seek to hide my actions as crimes, neither have I been
very wary to keep my self unknown; as well because I thought I might
wrong my self, as that it might in some manner disquiet me, which would
again have been contrary to the perfect repose of my minde which I seek.
And because having alwayes kept my self indifferent, caring not whether
I were known or no, I could not chuse but get some kinde of reputation,
I thought that I ought to do my best to hinder it at least from being
ill. The other reason which obliged me to write this, is, that observing
every day more and more the designe I have to instruct my self, retarded
by reason of an infinite number of experiments which are needful to me,
and which its impossible for me to make without the help of others;
although I do not so much flatter my self, as to hope that the Publick,
shares much in my concernments; yet will I not also be so much wanting
to my self, as to give any cause to those who shall survive me, to
reproach this, one day to me, That I could have left them divers things
far beyond what I have done, had I not too much neglected to make them
understand wherein they might contribute to my designe.

And I thought it easie for me to choose some matters, which being not
subject to many Controversies, nor obliging me to declare any more of my
Principles then I would willingly, would neverthelesse expresse clearly
enough, what my abilities or defects are in the Sciences. Wherein I
cannot say whether I have succeeded or no; neither will I prevent the
judgment of any man by speaking of my own Writings: but I should be
glad they might be examin'd; and to that end I beseech all those who
have any objections to make, to take the pains to send them to my
Stationer, that I being advertised by him, may endeavour at the same
time to adjoyn my Answer thereunto: and by that means, the Reader seeing
both the one and the other, may the more easily judge of the Truth. For
I promise, that I will never make any long Answers, but only very freely
confesse my own faults, if I find them; or if I cannot discover them,
plainly say what I shal think requisite in defence of what I have writ,
without adding the explanation of any new matter, that I may not
endlesly engage my self out of one into another.

Now if there be any whereof I have spoken in the beginning, of the
Opticks and of the Meteors, which at first jarr, by reason that I call
them Suppositions, and that I seem not willing to prove them; let a man
have but the patience to read the whole attentively, and I hope he will
rest satisfied: For (me thinks) the reasons follow each other so
closely, that as the later are demonstrated by the former, which are
their Causes; the former are reciprocally proved by the later, which are
their Effects. And no man can imagine that I herein commit the fault
which the Logicians call a _Circle_; for experience rendring the
greatest part of these effects most certain, the causes whence I deduce
them serve not so much to prove, as to explain them; but on the
contrary, they are those which are proved by them. Neither named I them
Suppositions, that it might be known that I conceive my self able to
deduce them from those first Truths which I have before discovered: But
that I would not expresly do it to crosse certain spirits, who imagine
that they know in a day al what another may have thought in twenty
yeers, as soon as he hath told them but two or three words; and who are
so much the more subject to erre, and less capable of the Truth, (as
they are more quick and penetrating) from taking occasion of erecting
some extravagant Philosophy on what they may beleeve to be my
Principles, and lest the fault should be attributed to me. For as for
those opinions which are wholly mine, I excuse them not as being new,
because that if the reasons of them be seriously considered, I assure my
self, they will be found so plain, and so agreeable to common sense,
that they will seem less extraordinary and strange then any other which
may be held on the same Subjects. Neither do I boast that I am the first
Inventor of any of them; but of this indeed, that I never admitted any
of them, neither because they had, or had not been said by others, but
only because Reason perswaded me to them.

If Mechanicks cannot so soon put in practise the Invention which is set
forth in the Opticks, I beleeve that therefore men ought not to condemn
it; forasmuch as skill and practice are necessary for the making and
compleating the Machines I have described; so that no circumstance
should be wanting. I should no less wonder if they should succeed at
first triall, then if a man should learn in a day to play excellently
well on a Lute, by having an exact piece set before him. And if I write
in French, which is the language of my Country, rather then in Latin,
which is that of my Tutors, 'tis because I hope such who use their meer
naturall reason, wil better judge of my opinions, then those who only
beleeve in old Books. And for those who joyn a right understanding with
study, (who I only wish for my Judges) I assure my self, they will not
be so partiall to the Latin, as to refuse to read my reasons because I
expresse them in a vulgar tongue.

To conclude, I will not speak here in particular of the progresse I
hoped to make hereafter in Learning; Nor engage my self by any promise
to the Publick, which I am not certain to perform. But I shall onely
say, That I am resolved to employ the remainder of my life in no other
thing but the study to acquire some such knowledge of Nature as may
furnish us with more certain rules in Physick then we hitherto have had:
And that my inclination drives me so strongly from all other kind of
designes, chiefly from those which cannot be profitable to any, but by
prejudicing others; that if any occasion obliged me to spend my time
therein, I should beleeve I should never succeed therein: which I here
declare, though I well know it conduceth not to make me considerable in
the world; neither is it my ambition to be so. And I shall esteem my
self always more obliged to those by whose favour I shal without
disturbance enjoy my ease, then to them who should proffer me the most
honourable imployment of the earth.

FINIS.

  +--------------------------------------------------------------+
  |                Transcriber's Notes and Errata                |
  |                                                              |
  | One instance each of "what-ever" and "whatever" were found   |
  | in the orignal.                                              |
  |                                                              |
  | The following typographical errors were corrected:           |
  |                                                              |
  |                |Error         |Correction   |                |
  |                |              |             |                |
  |                |or            |our          |                |
  |                |Phpsick       |Physick      |                |
  |                |moreworthy    |more worthy  |                |
  |                |examinanation |examination  |                |
  |                |mnner         |manner       |                |
  |                |propable      |probable     |                |
  |                |rape          |grape        |                |
  |                |veuture       |venture      |                |
  |                |circumstrance |circumstance |                |
  +--------------------------------------------------------------+






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