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The
Nature of the Human Mind
by René Descartes
I suppose...that all the things which I see are
fictitious; I believe that none of those objects
which my fallacious memory represents ever existed;
I suppose that I possess no senses; I believe that
body, figure, extension, motion, and place are
merely fictions of my mind. What is there, then,
that can be esteemed true? Perhaps this only, that
there is absolutely nothing certain.
But how do I know that there is not something
different altogether from the objects I have now
enumerated, of which it is impossible to entertain
the slightest doubt? Is there not a God, or some
being, by whatever name I may designate him, who
causes these thoughts to arise in my mind? But why
suppose such a being, for it may be I myself am
capable of producing them? Am I, then, at least not
something? But I before denied that I possessed
senses or a body; I hesitate, however, for what
follows from that? Am I so dependent on the body
and the senses that without these I cannot exist?
But I had the persuasion that there was absolutely
nothing in the world, that there was no sky and no
earth, neither minds nor bodies; was I not,
therefore, at the same time, persuaded that I did
not exist? Far from it; I assuredly existed, since
I was persuaded. But there is I know not what
being, who is possessed at once of the highest
power and the deepest cunning, who is constantly
employing all his ingenuity in deceiving me.
Doubtless, then, I exist, since I am deceived; and,
let him deceive me as he may, he can never bring it
about that I am nothing, so long as I shall be
conscious that I am something. So that it must, in
fine, be maintained, all things being maturely and
carefully considered, that this proposition I am, I
exist, is necessarily true each time it is
expressed by me, or conceived in my mind.
But I do not yet know with sufficient clearness
what I am, though assured that I am; and hence, in
the next place, I must take care, lest perchance I
inconsiderately substitute some other object in
room of what is properly myself, and thus wander
from the truth, even in that knowledge which I hold
to be of all others the most certain and evident.
For this reason, I will now consider anew what I
formerly believed myself to be, before I entered on
the present train of thought; and of my previous
opinion I will retrench all that can in the least
be invalidated by the grounds of doubt I have
adduced, in order that there may at length remain
nothing but what is certain and indubitable. What
then did I formerly think I was? Undoubtedly I
judged that I was a man. But what is a man? Shall I
say a rational animal? Assuredly not; for it would
be necessary forthwith to inquire into what is
meant by animal, and what by rational, and thus,
from a single question, I should insensibly glide
into others, and these more difficult than the
first; nor do I now possess enough of leisure to
warrant me in wasting my time amid subtleties of
this sort. I prefer here to attend to the thoughts
that sprung up of themselves in my mind, and were
inspired by my own nature alone, when I applied
myself to the consideration of what I was. In the
first place, then, I thought that I possessed a
countenance, hands, arms, and all the fabric of
members that appears in a corpse, and which 1
called by the name of body. It further occurred to
me that I was nourished, that I walked, perceived,
and thought, and all those actions I referred to
the soul; but what the soul itself was I either did
not stay to consider, or, if I did, I imagined that
it was something extremely rare and subtle, like
wind, or flame, or ether, spread through my grosser
parts. As regarded the body, I did not even doubt
of its nature, but thought I distinctly knew it,
and if I had wished to describe it according to the
notions I then entertained, I should have explained
myself in this manner: By body I understand all
that can be terminated by a certain figure; that
can be comprised in a certain place, and so fill a
certain space as therefrom to exclude every other
body; that can be perceived either by touch, sight,
hearing, taste, or smell; that can be moved in
different ways, not indeed of itself, but by
something foreign to it by which it is touched
[and from which it receives the
impression]; for the power of self-motion as
likewise that of perceiving and thinking, I held as
by no means pertaining to the nature of body; on
the contrary, I was somewhat astonished to find
such faculties existing in some bodies.
But [as to myself, what can I now say that I
am], since I suppose there exists an extremely
powerful, and, if I may so speak, malignant being,
whose whole endeavors are directed towards
deceiving me? Can I affirm that I possess any one
of all those attributes of which I have lately
spoken as belonging to the nature of body? After
attentively considering them in my own mind, I find
none of them that can properly be said to belong to
myself. To recount them were idle and tedious. Let
us pass, then, to the attributes of the soul. The
first mentioned were the powers of nutrition and
walking; but, if it be true that I have no body, it
is true likewise that I am capable neither of
walking nor of being nourished. Perception is
another attribute of the soul; but perception too
is impossible without the body: besides, I have
frequently, during sleep, believed that I perceived
objects which I afterwards observed I did not in
reality perceive. Thinking is another attribute of
the soul; and here I discover what properly belongs
to myself. This alone is inseparable from me. I am
-- I exist: this is certain; but how often? As
often as I think; for perhaps it would even happen,
if I should wholly cease to think, that I should at
the same time altogether cease to be. I now admit
nothing that is not necessarily true: I am
therefore, precisely speaking, only a thinking
thing, that is, a mind, understanding, or reason,
-- terms whose signification was before unknown to
me. I am, however, a real thing, and really
existent; but what thing? The answer was, a
thinking thing. The question now arises, am I aught
besides? I will stimulate my imagination with a
view to discover whether I am not still something
more than a thinking being. Now it is plain I am
not the assemblage of members called the human
body; I am not a thin and penetrating air diffused
through all these members, or wind, or flame, or
vapour, or breath, or any of all the things I can
imagine; for I supposed that all these were not,
and, without changing the supposition, I find that
I still feel assured of my existence.
But it is true, perhaps, that those very things
which I suppose to be nonexistent, because they are
unknown to me, are not in truth different from
myself whom I know. This is a point I cannot
determine, and do not now enter into any dispute
regarding it. I can only judge of things that are
known to me: I am conscious that I exist, and I who
know that I exist inquire into what I am. It is,
however, perfectly certain that the knowledge of my
existence, thus precisely taken, is not dependent
on things, the existence of which is as yet unknown
to me: and consequently it is not dependent on any
of the things I can feign in imagination. Moreover,
the phrase itself, I frame an image, reminds me of
my error; for I should in truth frame one if I were
to imagine myself to be anything, since to imagine
is nothing more than to contemplate the figure or
image or a corporeal thing; but I already know that
I exist, and that it is possible at the same time
that all those images, and in general all that
relates to the nature of body, are merely dreams
[or chimeras]. From this I discover that it
is not more reason. able to say, I will excite my
imagination that I may know more distinctly what I
am, than to express myself as follows: I am now
awake, and perceive something real; but because my
perception is not sufficiently clear, I will of
express purpose go to sleep that my dreams may
represent to me the object of my perception with
more truth and clearness. And, therefore, I know
that nothing of all that I can embrace in
imagination belongs to the knowledge which I have
of myself and that there is need to recall with the
utmost care the mind from this mode of thinking,
that it may be able to know its own nature with
perfect distinctness.
But what, then, am I? A thinking thing, it has
been said. But what is a thinking thing? It is a
thing that doubts, understands,
[conceives], affirms, denies, wills,
refuses, that imagines also, and perceives.
Assuredly it is not little, if all these properties
belong to my nature. But why should they not belong
to it? Am I not that very being who now doubts of
almost everything; who, for all that, understands
and conceives certain things; who affirms one alone
as true, and denies the others; who desires to know
more of them, and does not wish to be deceived; who
imagines many things sometimes even despite his
will; and is likewise percipient of many, as if
through the medium of the senses. Is there nothing
of all this as true as that I am, even although I
should be always dreaming, and although he who gave
me being employed all his ingenuity to deceive me?
Is there also any one of these attributes that can
be properly distinguished from my thought, or that
can be said to be separate from myself? For it is
of itself so evident that it is I who doubt, I who
understand, and I who desire, that it is here
unnecessary to add anything by way of rendering it
more clear. And I am as certainly the same being
who imagines; for, although it may be (as I before
supposed) that nothing I imagine is true, still the
power of imagination does not cease really to exist
in me and to form part of my thought. In fine, I am
the same being who perceives, that is, who
apprehends certain objects as by the organs of
sense, since, in truth, I see light, hear a noise,
and feel heat. But it will be said that these
presentations are false, and that I am dreaming.
Let it be so. At all events it is certain that I
seem to see light, hear a noise, and feel heat;
this cannot be false, and this is what in me is
properly called perceiving, which is nothing else
than thinking. From this I begin to know what I am
with somewhat greater clearness and distinctness
than heretofore.
But, nevertheless, it still seems to me, and I
cannot help believing, that corporeal things, whose
images are formed by thought, [which fall under
the senses], and are examined by the same, are
known with much greater distinctness than that I
know not what part of myself which is not
imaginable; although, in truth, it may seem strange
to say that I know and comprehend with greater
distinctness things whose existence appears to me
doubtful, that are unknown, and do not belong to
me, than others of whose reality I am persuaded,
that are known to me, and appertain to my proper
nature; in a word, than myself. But I see clearly
what is the state of the case. My mind is apt to
wander, and will not yet submit to be restrained
within the limits of truth. Let us therefore leave
the mind to itself once more, and, according to it
every kind of liberty, [permit it to consider
the objects that appear to it from without], in
order that, having afterwards withdrawn it from
these gently and opportunely, [and fixed it on
the consideration of its being and the properties
it finds in itself], it may then be the more
easily controlled.
Let us now accordingly consider the objects that
are commonly thought to be [the most easily,
and likewise] the most distinctly known, viz.,
the bodies we touch and see; not, indeed, bodies in
general, for these general notions are usually
somewhat more confused, but one body in particular.
Take, for example, this piece of wax; it is quite
fresh, having been but recently taken from a
beehive; it has not yet lost the sweetness of the
honey contained; it still retains somewhat of the
odor of the flowers from which it was gathered; its
color, figure, size, are apparent (to the sight);
if is hard cold, easily handed; and sounds when
struck upon with the finger. In fine, all that
contributes to make a body as distinctly known as
possible, is found in the one before us. But, while
I am speaking, let it be placed near the fire --
what remained of the taste exhales, the smell
evaporates, the color changes its figure is
destroyed, its size increases, it becomes liquid,
it grows hot, it can hardly be handled, and,
although struck upon, it emits no sound. Does the
same wax still remain after this change? It must be
admitted that it does remain; no one doubts it, or
judges otherwise. What, then, was it I knew with so
much distinctness in the piece of wax? Assuredly,
it could be nothing of all that I observed by means
of the senses, since all the things that fell under
taste, smell, sight, touch, and hearing are
changed, and yet the same wax remains. It was
perhaps what I now think, viz., that this wax was
neither the sweetness of the honey, the pleasant
odor of flowers, the whiteness, the figure, nor the
sound, but only a body that a little before
appeared to me conspicuous under these forms, and
which is now perceived under others But, to speak
precisely, what is it that I imagine when I think
of it in this way? Let it be attentively
considered, and retrenching all that does not
belong to the wax let us see what remains. There
certainly remains nothing except something
extended, flexible, and movable. But what is meant
by flexible and movable? Is it not that I imagine
that the piece of wax being round, is capable of
becoming square or of passing from a square into a
triangular figure? Assuredly such is not the case,
because I conceive that it admits of an infinity of
similar changes; and I am, moreover, unable to
compass this infinity by imagination, and
consequently this conception which I have of the
wax is not the product of the faculty of
imagination. But what now is this extension? Is it
not also unknown? for it becomes greater when the
wax is melted, greater when it is boiled, and
greater still when the heat increases; and I should
not conceive [clearly and] according to
truth, the wax as it is, if I did not suppose that
the piece we are considering admitted even of a
wider variety of extension than I ever imagined. I
must, therefore, admit that I cannot even
comprehend by imagination what the piece of wax is,
and that it is the mind alone which perceives it. I
speak of one piece in particular; for, as to wax in
general, this is still more evident. But what is
the piece of wax that can be perceived only by the
[understanding or] mind? It is certainly
the same which I see, touch, imagine; and, in fine,
it is the same which, from the beginning, I
believed it to be. But (and this it is of moment to
observe) the perception of it is neither an act of
sight, of touch, nor of imagination, and never was
either of these, though it might formerly seem so,
but is simply an intuition of the mind, which may
be imperfect and confused, as it formerly was, or
very clear and distinct, as it is at present,
according as the attention is more or less directed
to the elements which it contains, and of which it
is composed.
But, meanwhile, I feel greatly astonished when I
observe [the weakness of my mind, and] its
proneness to error. For although, without at all
giving expression to what I think, I consider all
this in my own mind, words yet occasionally impede
my progress, and I am almost led into error by the
terms of ordinary language. We say, for example,
that we see the same wax when it is before us, and
not that we judge it to be the same from its
retaining the same color and figure: whence I
should forthwith be disposed to conclude that the
wax is known by the act of sight, and not by the
intuition of the mind alone, were it not for the
analogous instance of human beings passing on in
the street below, as observed from a window. In
this case I do not fail to say that I see the men
themselves, just as I say that I see the wax; and
yet what do I see from the window beyond hats and
cloaks that might cover artificial machines, whose
motions might be determined by springs? But I judge
that there are human beings from these appearances,
and thus I comprehend, by the faculty of judgment
alone which is in the mind, what I believed I saw
with my eyes.
The man who makes it his aim to rise to
knowledge superior to the common, ought to be
ashamed to seek occasions of doubting from the
vulgar forms of speech: instead, therefore, of
doing this, I shall proceed with the matter in
hand, and inquire whether I had a clearer and more
perfect perception of the piece of wax when I first
saw it, and when I thought I knew it by means of
the external sense itself, or, at all events, by
the common sense, as it is called, that is, by the
imaginative faculty; or whether I rather apprehend
it more clearly at present, after having examined
with greater care, both what it is, and in what way
it can be known. It would certainly be ridiculous
to entertain any doubt on this point. For what, in
that first perception, was there distinct? What did
I perceive which any animal might not have
perceived? But when I distinguish the wax from its
exterior forms, and when, as if I had stripped it
of its vestments, I consider it quite naked, it is
certain, although some error may still be found in
my judgment, that I cannot, nevertheless, thus
apprehend it without possessing a human mind.
But, finally, what shall I say of the mind
itself, that is, of myself? for as yet I do not
admit that I am anything but mind. What, then I who
seem to possess so distinct an apprehension of the
piece of wax, -- do I not know myself, both with
greater truth and certitude, and also much more
distinctly and clearly? For if I judge that the wax
exists because I see it, it assuredly follows, much
more evidently, that I myself am or exist, for the
same reason: for it is possible that what I see may
not in truth be wax, and that I do not even possess
eyes with which to see anything; but it cannot be
that when I see, or, which comes to the same thing,
when I think I see, I myself who think am nothing.
So likewise, if I judge that the wax exists because
I touch it, it will also follow that I am; and if I
determine that my imagination, or any other cause,
whatever it be, persuades me of the existence of
the wax, I will still draw the same conclusion. And
what is here remarked of the piece of wax, is
applicable to all the other things that are
external to me. And further, if the [notion
or] perception of wax appeared to me more
precise and distinct, after that not only sight and
touch, but many other causes besides, rendered it
manifest to my apprehension, with how much greater
distinctness must I now know myself, since all the
reasons that contribute to the knowledge of the
nature of wax, or of any body whatever, manifest
still better the nature of my mind? And there are
besides so many other things in the mind itself
that contribute to the illustration of its nature,
that those dependent on the body, to which I have
here referred, scarcely merit to be taken into
account.
But, in conclusion, I find I have insensibly
reverted to the point I desired; for, since it is
now manifest to me that bodies themselves are not
properly perceived by the senses nor by the faculty
of imagination, but by the intellect alone; and
since they are not perceived because they are seen
and touched, but only because they are understood
[or rightly comprehended by thought], I
readily discover that there is nothing more easily
or clearly apprehended than my own mind. But
because it is difficult to rid one's self so
promptly of an opinion to which one has been long
accustomed, it will be desirable to tarry for some
time at this stage, that, by long continued
meditation, I may more deeply impress upon my
memory this new knowledge.
Excerpted from Meditations on
First Philosophy, by René
Descartes
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Meditations
on First
Philosophy,
by
René Descartes
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