Philosophy

Selections from the Principles of Philosophy

Rene Descartes

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XXXIII. That we never err unless when we judge of something which
we do not sufficiently apprehend.

When we apprehend anything we are in no danger of error, if we
refrain from judging of it in any way; and even when we have formed
a judgment regarding it, we would never fall into error, provided we
gave our assent only to what we clearly and distinctly perceived;
but the reason why we are usually deceived, is that we judge without
possessing an exact knowledge of that of which we judge.

 XXXIV. That the will as well as the understanding is required for
judging.

I admit that the understanding is necessary for judging, there being
no room to suppose that we can judge of that which we in no way
apprehend; but the will also is required in order to our assenting
to what we have in any degree perceived. It is not necessary,
however, at least to form any judgment whatever, that we have an
entire and perfect apprehension of a thing; for we may assent to
many things of which we have only a very obscure and confused
knowledge.

 XXXV. That the will is of greater extension than the understanding,
and is thus the source of our errors.

Further, the perception of the intellect extends only to the few
things that are presented to it, and is always very limited: the
will, on the other hand, may, in a certain sense, be said to be
infinite, because we observe nothing that can be the object of the
will of any other, even of the unlimited will of God, to which ours
cannot also extend, so that we easily carry it beyond the objects we
clearly perceive; and when we do this, it is not wonderful that we
happen to be deceived.

 XXXVI. That our errors cannot be imputed to God.

But although God has not given us an omniscient understanding, he is
not on this account to be considered in any wise the author of our
errors, for it is of the nature of created intellect to be finite,
and of finite intellect not to embrace all things.

 XXXVII. That the chief perfection of man is his being able to act
freely or by will, and that it is this which renders him worthy of
praise or blame.

That the will should be the more extensive is in harmony with its
nature: and it is a high perfection in man to be able to act by
means of it, that is, freely; and thus in a peculiar way to be the
master of his own actions, and merit praise or blame. For self-
acting machines are not commended because they perform with
exactness all the movements for which they were adapted, seeing
their motions are carried on necessarily; but the maker of them is
praised on account of the exactness with which they were framed,
because he did not act of necessity, but freely; and, on the same
principle, we must attribute to ourselves something more on this
account, that when we embrace truth, we do so not of necessity, but
freely.

 XXXVIII. That error is a defect in our mode of acting, not in our
nature; and that the faults of their subjects may be frequently
attributed to other masters, but never to God.

It is true, that as often as we err, there is some defect in our
mode of action or in the use of our liberty, but not in our nature,
because this is always the same, whether our judgments be true or
false. And although God could have given to us such perspicacity of
intellect that we should never have erred, we have, notwithstanding,
no right to demand this of him; for, although with us he who was
able to prevent evil and did not is held guilty of it, God is not in
the same way to be reckoned responsible for our errors because he
had the power to prevent them, inasmuch as the dominion which some
men possess over others has been instituted for the purpose of
enabling them to hinder those under them from doing evil, whereas
the dominion which God exercises over the universe is perfectly
absolute and free. For this reason we ought to thank him for the
goods he has given us, and not complain that he has not blessed us
with all which we know it was in his power to impart.

 XXXIX. That the liberty of our will is self-evident.

Finally, it is so manifest that we possess a free will, capable of
giving or withholding its assent, that this truth must be reckoned
among the first and most common notions which are born with us.
This, indeed, has already very clearly appeared, for when essaying
to doubt of all things, we went so far as to suppose even that he
who created us employed his limitless power in deceiving us in every
way, we were conscious nevertheless of being free to abstain from
believing what was not in every respect certain and undoubted. Bat
that of which we are unable to doubt at such a time is as self-
evident and clear as any thing we can ever know.

 XL. That it is likewise certain that God has fore-ordained all
things.

But because what we have already discovered of God, gives us the
assurance that his power is so immense that we would sin in thinking
ourselves capable of ever doing anything which he had not ordained
beforehand, we should soon be embarrassed in great difficulties if
we undertook to harmonise the pre-ordination of God with the freedom
of our will, and endeavoured to comprehend both truths at once.

 XLI. How the freedom of our will may be reconciled with the Divine
pre-ordination.

But, in place of this, we will be free from these embarrassments if
we recollect that our mind is limited, while the power of God, by
which he not only knew from all eternity what is or can be, but also
willed and pre-ordained it, is infinite. It thus happens that we
possess sufficient intelligence to know clearly and distinctly that
this power is in God, but not enough to comprehend how he leaves the
free actions of men indeterminate} and, on the other hand, we have
such consciousness of the liberty and indifference which exists in
ourselves, that there is nothing we more clearly or perfectly
comprehend: [so that the omnipotence of God ought not to keep us
from believing it]. For it would be absurd to doubt of that of which
we are fully conscious, and which we experience as existing in
ourselves, because we do not comprehend another matter which, from
its very nature, we know to be incomprehensible.

 XLII. How, although we never will to err, it is nevertheless by our
will that we do err.

But now since we know that all our errors depend upon our will, and
as no one wishes to deceive himself, it may seem wonderful that
there is any error in our judgments at all. It is necessary to
remark, however, that there is a great difference between willing to
be deceived, and willing to yield assent to opinions in which it
happens that error is found. For though there is no one who
expressly wishes to fall into error, we will yet hardly find any one
who is not ready to assent to things in which, unknown to himself,
error lurks; and it even frequently happens that it is the desire
itself of following after truth that leads those not fully aware of
the order in which it ought to be sought for, to pass judgment on
matters of which they have no adequate knowledge, and thus to fall
into error.

 XLIII. That we shall never err if we give our assent only to what
we clearly and distinctly perceive.

But it is certain we will never admit falsity for truth, so long as
we judge only of that which we clearly and distinctly perceive;
because, as God is no deceiver, the faculty of knowledge which he
has given us cannot be fallacious, nor, for the same reason, the
faculty of will, when we do not extend it beyond the objects we
clearly know. And even although this truth could not be established
by reasoning, the minds of all have been so impressed by nature as
spontaneously to assent to whatever is clearly perceived, and to
experience an impossibility to doubt of its truth.

 XLIV. That we uniformly judge improperly when we assent to what we
do not clearly perceive, although our judgment may chance to be
true; and that it is frequently our memory which deceives us by
leading us to believe that certain things were formerly sufficiently
understood by us.

It is likewise certain that, when we approve of any reason which we
do not apprehend, we are either deceived, or, if we stumble on the
truth, it is only by chance, and thus we can never possess the
assurance that we are not in error. I confess it seldom happens that
we judge of a thing when we have observed we do not apprehend it,
because it is a dictate of the natural light never to judge of what
we do not know. But we most frequently err in this, that we presume
upon a past knowledge of much to which we give our assent, as to
something treasured up in the memory, and perfectly known to us;
whereas, in truth, we have no such knowledge.

 XLV. What constitutes clear and distinct perception.

There are indeed a great many persons who, through their whole
lifetime, never perceive anything in a way necessary for judging of
it properly; for the knowledge upon which we can establish a certain
and indubitable judgment must be not only clear, but also, distinct.
I call that clear which is present and manifest to the mind giving
attention to it, just as we are said clearly to see objects when,
being present to the eye looking on, they stimulate it with
sufficient force. and it is disposed to regard them; but the
distinct is that which is so precise and different from all other
objects as to comprehend in itself only what is clear. [Footnote:
"what appears manifestly to him who considers it as he ought."--
FRENCH.]

 XLVI. It is shown, from the example of pain, that a perception may
be clear without being distinct, but that it cannot be distinct
unless it is clear.

For example, when any one feels intense pain, the knowledge which he
has of this pain is very clear, but it is not always distinct; for
men usually confound it with the obscure judgment they form
regarding its nature, and think that there is in the suffering part
something similar to the sensation of pain of which they are alone
conscious. And thus perception may be clear without being distinct,
but it can never be distinct without likewise being clear.

 XLVII. That, to correct the prejudices of our early years, we must
consider what is clear in each of our simple [Footnote: "first."--
FRENCH.] notions.

And, indeed, in our early years, the mind was so immersed in the
body, that, although it perceived many things with sufficient
clearness, it yet knew nothing distinctly; and since even at that
time we exercised our judgment in many matters, numerous prejudices
were thus contracted, which, by the majority, are never afterwards
laid aside. But that we may now be in a position to get rid of
these, I will here briefly enumerate all the simple notions of which
our thoughts are composed, and distinguish in each what is clear
from what is obscure, or fitted to lead into error.

 XLVIII. That all the objects of our knowledge are to be regarded
either (1) as things or the affections of things: or (2) as eternal
truths; with the enumeration of things.

Whatever objects fall under our knowledge we consider either as
things or the affections of things,[Footnote: Things and the
affections of things are (in the French) equivalent to "what has
some (i.e., a REAL) existence," as opposed to the class of "eternal
truths," which have merely an IDEAL existence.] or as eternal truths
possessing no existence beyond our thought. Of the first class the
most general are substance, duration, order, number, and perhaps
also some others, which notions apply to all the kinds of things. I
do not, however, recognise more than two highest kinds (SUMMA
GENERA) of things; the first of intellectual things, or such as have
the power of thinking, including mind or thinking substance and its
properties; the second, of material things, embracing extended
substance, or body and its properties. Perception, volition, and all
modes as well of knowing as of willing, are related to thinking
substance; on the other hand, to extended substance we refer
magnitude, or extension in length, breadth, and depth, figure,
motion, situation, divisibility of parts themselves, and the like.
There are, however, besides these, certain things of which we have
an internal experience that ought not to be referred either to the
mind of itself, or to the body alone, but to the close and intimate
union between them, as will hereafter be shown in its place. Of this
class are the appetites of hunger and thirst, etc., and also the
emotions or passions of the mind which are not exclusively mental
affections, as the emotions of anger, joy, sadness, love, etc.; and,
finally, all the sensations, as of pain, titillation, light and
colours, sounds, smells, tastes, heat, hardness, and the other
tactile qualities.

 XLIX. That the eternal truths cannot be thus enumerated, but that
this is not necessary.

What I have already enumerated we are to regard as things, or the
qualities or modes of things. We now come to speak of eternal
truths. When we apprehend that it is impossible a thing can arise
from nothing, this proposition, EX NIHILO NIHIL FIT, is not
considered as somewhat existing, or as the mode of a thing, but as
an eternal truth having its seat in our mind, and is called a common
notion or axiom. Of this class are the following:--It is impossible
the same thing can at once be and not be; what is done cannot be
undone; he who thinks must exist while he thinks; and innumerable
others, the whole of which it is indeed difficult to enumerate, but
this is not necessary, since, if blinded by no prejudices, we cannot
fail to know them when the occasion of thinking them occurs.

 L. That these truths are clearly perceived, but not equally by all
men, on account of prejudices.

And, indeed, with regard to these common notions, it is not to be
doubted that they can be clearly and distinctly known, for otherwise
they would not merit this appellation: as, in truth, some of them
are not, with respect to all men, equally deserving of the name,
because they are not equally admitted by all: not, however, from
this reason, as I think, that the faculty of knowledge of one man
extends farther than that of another, but rather because these
common notions are opposed to the prejudices of some, who, on this
account, are not able readily to embrace them, even although others,
who are free from those prejudices, apprehend them with the greatest
clearness.

 LI. What substance is, and that the term is not applicable to God
and the creatures in the same sense.

But with regard to what we consider as things or the modes of
things, it is worth while to examine each of them by itself. By
substance we can conceive nothing else than a thing which exists in
such a way as to stand in need of nothing beyond itself in order to
its existence. And, in truth, there can be conceived but one
substance which is absolutely independent, and that is God. We
perceive that all other things can exist only by help of the
concourse of God. And, accordingly, the term substance does not
apply to God and the creatures UNIVOCALLY, to adopt a term familiar
in the schools; that is, no signification of this word can be
distinctly understood which is common to God and them.

 LII. That the term is applicable univocally to the mind and the
body, and how substance itself is known.

Created substances, however, whether corporeal or thinking, may be
conceived under this common concept; for these are things which, in
order to their existence, stand in need of nothing but the concourse
of God. But yet substance cannot be first discovered merely from its
being a thing which exists independently, for existence by itself is
not observed by us. We easily, however, discover substance itself
from any attribute of it, by this common notion, that of nothing
there are no attributes, properties, or qualities: for, from
perceiving that some attribute is present, we infer that some
existing thing or substance to which it may be attributed is also of
necessity present.

 LIII. That of every substance there is one principal attribute, as
thinking of the mind, extension of the body.

But, although any attribute is sufficient to lead us to the
knowledge of substance, there is, however, one principal property of
every substance, which constitutes its nature or essence, and upon
which all the others depend. Thus, extension in length, breadth, and
depth, constitutes the nature of corporeal substance; and thought
the nature of thinking substance. For every other thing that can be
attributed to body, presupposes extension, and is only some mode of
an extended thing; as all the properties we discover in the mind are
only diverse modes of thinking. Thus, for example, we cannot
conceive figure unless in something extended, nor motion unless in
extended space, nor imagination, sensation, or will, unless in a
thinking thing. But, on the other hand, we can conceive extension
without figure or motion, and thought without imagination or
sensation, and so of the others; as is clear to any one who attends
to these matters.

 LIV. How we may have clear and distinct notions of the substance
which thinks, of that which is corporeal, and of God.

And thus we may easily have two clear and distinct notions or ideas,
the one of created substance, which thinks, the other of corporeal
substance, provided we carefully distinguish all the attributes of
thought from those of extension. We may also have a clear and
distinct idea of an uncreated and independent thinking substance,
that is, of God, provided we do not suppose that this idea
adequately represents to us all that is in God, and do not mix up
with it anything fictitious, but attend simply to the characters
that are comprised in the notion we have of him, and which we
clearly know to belong to the nature of an absolutely perfect Being.
For no one can deny that there is in us such an idea of God, without
groundlessly supposing that there is no knowledge of God at all in
the human mind.

 LV. How duration, order, and number may be also distinctly
conceived.

We will also have most distinct conceptions of duration, order, and
number, if, in place of mixing up with our notions of them that
which properly belongs to the concept of substance, we merely think
that the duration of a thing is a mode under which we conceive this
thing, in so far as it continues to exist; and, in like manner, that
order and number are not in reality different from things disposed
in order and numbered, but only modes under which we diversely
consider these things.

 LVI. What are modes, qualities, attributes.

And, indeed, we here understand by modes the same with what we
elsewhere designate attributes or qualities. But when we consider
substance as affected or varied by them, we use the term modes; when
from this variation it may be denominated of such a kind, we adopt
the term qualities [to designate the different modes which cause it
to be so named]; and, finally, when we simply regard these modes as
in the substance, we call them attributes. Accordingly, since God
must be conceived as superior to change, it is not proper to say
that there are modes or qualities in him, but simply attributes; and
even in created things that which is found in them always in the
same mode, as existence and duration in the thing which exists and
endures, ought to be called attribute and not mode or quality.

 LVII. That some attributes exist in the things to which they are
attributed, and others only in our thought; and what duration and
time are.

Of these attributes or modes there are some which exist in the
things themselves, and others that have only an existence in our
thought; thus, for example, time, which we distinguish from duration
taken in its generality, and call the measure of motion, is only a
certain mode under which we think duration itself, for we do not
indeed conceive the duration of things that are moved to be
different from the duration of things that are not moved: as is
evident from this, that if two bodies are in motion for an hour, the
one moving quickly and the other slowly, we do not reckon more time
in the one than in the other, although there may be much more motion
in the one of the bodies than in the other. But that we may
comprehend the duration of all things under a common measure, we
compare their duration with that of the greatest and most regular
motions that give rise to years and days, and which we call time;
hence what is so designated is nothing superadded to duration, taken
in its generality, but a mode of thinking.
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