Philosophy

Selections from the Principles of Philosophy

Rene Descartes

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XII. How it happens that every one does not come equally to know
this.

Those who have not philosophized in order have had other opinions on
this subject, because they never distinguished with sufficient care
the mind from the body. For, although they had no difficulty in
believing that they themselves existed, and that they had a higher
assurance of this than of any other thing, nevertheless, as they did
not observe that by THEMSELVES, they ought here to understand their
MINDS alone [when the question related to metaphysical certainty];
and since, on the contrary, they rather meant their bodies which
they saw with their eyes, touched with their hands, and to which
they erroneously attributed the faculty of perception, they were
prevented from distinctly apprehending the nature of the mind.

 XIII. In what sense the knowledge of other things depends upon the
knowledge of God.

But when the mind, which thus knows itself but is still in doubt as
to all other things, looks around on all sides, with a view to the
farther extension of its knowledge, it first of all discovers within
itself the ideas of many things; and while it simply contemplates
them, and neither affirms nor denies that there is anything beyond
itself corresponding to them, it is in no danger of erring. The mind
also discovers certain common notions out of which it frames various
demonstrations that carry conviction to such a degree as to render
doubt of their truth impossible, so long as we give attention to
them. For example, the mind has within itself ideas of numbers and
figures, and it has likewise among its common notions the principle
THAT IF EQUALS BE ADDED TO EQUALS THE WHOLES WILL BE EQUAL and the
like; from which it is easy to demonstrate that the three angles of
a triangle are equal to two right angles, etc. Now, so long as we
attend to the premises from which this conclusion and others similar
to it were deduced, we feel assured of their truth; but, as the mind
cannot always think of these with attention, when it has the
remembrance of a conclusion without recollecting the order of its
deduction, and is uncertain whether the author of its being has
created it of a nature that is liable to be deceived, even in what
appears most evident, it perceives that there is just ground to
distrust the truth of such conclusions, and that it cannot possess
any certain knowledge until it has discovered its author.

 XIV. That we may validly infer the existence of God from necessary
existence being comprised in the concept we have of him.

When the mind afterwards reviews the different ideas that are in it,
it discovers what is by far the chief among them--that of a Being
omniscient, all-powerful, and absolutely perfect; and it observes
that in this idea there is contained not only possible and
contingent existence, as in the ideas of all other things which it
clearly perceives, but existence absolutely necessary and eternal.
And just as because, for example, the equality of its three angles
to two right angles is necessarily comprised in the idea of a
triangle, the mind is firmly persuaded that the three angles of a
triangle are equal to two right angles; so, from its perceiving
necessary and eternal existence to be comprised in the idea which it
has of an all-perfect Being, it ought manifestly to conclude that
this all-perfect Being exists.

 XV. That necessary existence is not in the same way comprised in
the notions which we have of other things, but merely contingent
existence.

The mind will be still more certain of the truth of this conclusion,
if it consider that it has no idea of any other thing in which it
can discover that necessary existence is contained; for, from this
circumstance alone, it will discern that the idea of an all-perfect
Being has not been framed by itself, and that it does not represent
a chimera, but a true and immutable nature, which must exist since
it can only be conceived as necessarily existing.

 XVI. That prejudices hinder many from clearly knowing the necessity
of the existence of God.

Our mind would have no difficulty in assenting to this truth, if it
were, first of all, wholly free from prejudices; but as we have been
accustomed to distinguish, in all other things, essence from
existence, and to imagine at will many ideas of things which neither
are nor have been, it easily happens, when we do not steadily fix
our thoughts on the contemplation of the all-perfect Being, that a
doubt arises as to whether the idea we have of him is not one of
those which we frame at pleasure, or at least of that class to whose
essence existence does not pertain.

 XVII. That the greater objective (representative) perfection there
is in our idea of a thing, the greater also must be the perfection
of its cause.

When we further reflect on the various ideas that are in us, it is
easy to perceive that there is not much difference among them, when
we consider them simply as certain modes of thinking, but that they
are widely different, considered in reference to the objects they
represent; and that their causes must be so much the more perfect
according to the degree of objective perfection contained in them.
[Footnote: "as what they represent of their object has more
perfection."--FRENCH.] For there is no difference between this and
the case of a person who has the idea of a machine, in the
construction of which great skill is displayed, in which
circumstances we have a right to inquire how he came by this idea,
whether, for example, he somewhere saw such a machine constructed by
another, or whether he was so accurately taught the mechanical
sciences, or is endowed with such force of genius, that he was able
of himself to invent it, without having elsewhere seen anything like
it; for all the ingenuity which is contained in the idea objectively
only, or as it were in a picture, must exist at least in its first
and chief cause, whatever that may be, not only objectively or
representatively, but in truth formally or eminently.

 XVIII. That the existence of God may be again inferred from the
above.

Thus, because we discover in our minds the idea of God, or of an
all-perfect Being, we have a right to inquire into the source whence
we derive it; and we will discover that the perfections it
represents are so immense as to render it quite certain that we
could only derive it from an all-perfect Being; that is, from a God
really existing. For it is not only manifest by the natural light
that nothing cannot be the cause of anything whatever, and that the
more perfect cannot arise from the less perfect, so as to be thereby
produced as by its efficient and total cause, but also that it is
impossible we can have the idea or representation of anything
whatever, unless there be somewhere, either in us or out of us, an
original which comprises, in reality, all the perfections that are
thus represented to us; but, as we do not in any way find in
ourselves those absolute perfections of which we have the idea, we
must conclude that they exist in some nature different from ours,
that is, in God, or at least that they were once in him; and it most
manifestly follows [from their infinity] that they are still there.

 XIX. That, although we may not comprehend the nature of God, there
is yet nothing which we know so clearly as his perfections.

This will appear sufficiently certain and manifest to those who have
been accustomed to contemplate the idea of God, and to turn their
thoughts to his infinite perfections; for, although we may not
comprehend them, because it is of the nature of the infinite not to
be comprehended by what is finite, we nevertheless conceive them
more clearly and distinctly than material objects, for this reason,
that, being simple, and unobscured by limits,[Footnote: After
LIMITS, "what of them we do conceive is much less confused. There
is, besides, no speculation more calculated to aid in perfecting our
understanding, and which is more important than this, inasmuch as
the consideration of an object that has no limits to its perfections
fills us with satisfaction and assurance."-FRENCH.] they occupy our
mind more fully.

 XX. That we are not the cause of ourselves, but that this is God,
and consequently that there is a God.

But, because every one has not observed this, and because, when we
have an idea of any machine in which great skill is displayed, we
usually know with sufficient accuracy the manner in which we
obtained it, and as we cannot even recollect when the idea we have
of a God was communicated to us by him, seeing it was always in our
minds, it is still necessary that we should continue our review, and
make inquiry after our author, possessing, as we do, the idea of the
infinite perfections of a God: for it is in the highest degree
evident by the natural light, that that which knows something more
perfect than itself, is not the source of its own being, since it
would thus have given to itself all the perfections which it knows;
and that, consequently, it could draw its origin from no other being
than from him who possesses in himself all those perfections, that
is, from God.

 XXI. That the duration alone of our life is sufficient to
demonstrate the existence of God.

The truth of this demonstration will clearly appear, provided we
consider the nature of time, or the duration of things; for this is
of such a kind that its parts are not mutually dependent, and never
co-existent; and, accordingly, from the fact that we now are, it
does not necessarily follow that we shall be a moment afterwards,
unless some cause, viz., that which first produced us, shall, as it
were, continually reproduce us, that is, conserve us. For we easily
understand that there is no power in us by which we can conserve
ourselves, and that the being who has so much power as to conserve
us out of himself, must also by so much the greater reason conserve
himself, or rather stand in need of being conserved by no one
whatever, and, in fine, be God.

 XXII. That in knowing the existence of God, in the manner here
explained, we likewise know all his attributes, as far as they can
be known by the natural light alone.

There is the great advantage in proving the existence of God in this
way, viz., by his idea, that we at the same time know what he is, as
far as the weakness of our nature allows; for, reflecting on the
idea we have of him which is born with us, we perceive that he is
eternal, omniscient, omnipotent, the source of all goodness and
truth, creator of all things, and that, in fine, he has in himself
all that in which we can clearly discover any infinite perfection or
good that is not limited by any imperfection.

 XXIII. That God is not corporeal, and does not perceive by means of
senses as we do, or will the evil of sin.

For there are indeed many things in the world that are to a certain
extent imperfect or limited, though possessing also some perfection;
and it is accordingly impossible that any such can be in God. Thus,
looking to corporeal nature,[Footnote: In the French, "since
extension constitutes the nature of body."] since divisibility is
included in local extension, and this indicates imperfection, it is
certain that God is not body. And although in men it is to some
degree a perfection to be capable of perceiving by means of the
senses, nevertheless since in every sense there is passivity
[Footnote: In the French, "because our perceptions arise from
impressions made upon us from another source," i.e., than
ourselves.] which indicates dependency, we must conclude that God is
in no manner possessed of senses, and that he only understands and
wills, not, however, like us, by acts in any way distinct, but
always by an act that is one, identical, and the simplest possible,
understands, wills, and operates all, that is, all things that in
reality exist; for he does not will the evil of sin, seeing this is
but the negation of being.

 XXIV. That in passing from the knowledge of God to the knowledge of
the creatures, it is necessary to remember that our understanding is
finite, and the power of God infinite.

But as we know that God alone is the true cause of all that is or
can be, we will doubtless follow the best way of philosophizing, if,
from the knowledge we have of God himself, we pass to the
explication of the things which he has created, and essay to deduce
it from the notions that are naturally in our minds, for we will
thus obtain the most perfect science, that is, the knowledge of
effects through their causes. But that we may be able to make this
attempt with sufficient security from error, we must use the
precaution to bear in mind as much as possible that God, who is the
author of things, is infinite, while we are wholly finite.

 XXV. That we must believe all that God has revealed, although it
may surpass the reach of our faculties.

Thus, if perhaps God reveal to us or others, matters concerning
himself which surpass the natural powers of our mind, such as the
mysteries of the incarnation and of the trinity, we will not refuse
to believe them, although we may not clearly understand them; nor
will we be in any way surprised to find in the immensity of his
nature, or even in what he has created, many things that exceed our
comprehension.

 XXVI. That it is not needful to enter into disputes [Footnote: "to
essay to comprehend the infinite."--FRENCH.] regarding the infinite,
but merely to hold all that in which we can find no limits as
indefinite, such as the extension of the world, the divisibility of
the parts of matter, the number of the stars, etc.

We will thus never embarrass ourselves by disputes about the
infinite, seeing it would be absurd for us who are finite to
undertake to determine anything regarding it, and thus as it were to
limit it by endeavouring to comprehend it. We will accordingly give
ourselves no concern to reply to those who demand whether the half
of an infinite line is also infinite, and whether an infinite number
is even or odd, and the like, because it is only such as imagine
their minds to be infinite who seem bound to entertain questions of
this sort. And, for our part, looking to all those things in which
in certain senses, we discover no limits, we will not, therefore,
affirm that they are infinite, but will regard them simply as
indefinite. Thus, because we cannot imagine extension so great that
we cannot still conceive greater, we will say that the magnitude of
possible things is indefinite, and because a body cannot be divided
into parts so small that each of these may not be conceived as again
divided into others still smaller, let us regard quantity as
divisible into parts whose number is indefinite; and as we cannot
imagine so many stars that it would seem impossible for God to
create more, let us suppose that their number is indefinite, and so
in other instances.

 XXVII. What difference there is between the indefinite and the
infinite.

And we will call those things indefinite rather than infinite, with
the view of reserving to God alone the appellation of infinite; in
the first place, because not only do we discover in him alone no
limits on any side, but also because we positively conceive that he
admits of none; and in the second place, because we do not in the
same way positively conceive that other things are in every part
unlimited, but merely negatively admit that their limits, if they
have any, cannot be discovered by us.

 XXVIII. That we must examine, not the final, but the efficient,
causes of created things.

Likewise, finally, we will not seek reasons of natural things from
the end which God or nature proposed to himself in their creation
(i. e., final causes), [Footnote: "We will not stop to consider the
ends which God proposed to himself in the creation of the world, and
we will entirely reject from our philosophy the search of final
causes!"--French.] for we ought not to presume so far as to think
that we are sharers in the counsels of Deity, but, considering him
as the efficient cause of all things, let us endeavour to discover
by the natural light [Footnote: "Faculty of reasoning."--FRENCH.]
which he has planted in us, applied to those of his attributes of
which he has been willing we should have some knowledge, what must
be concluded regarding those effects we perceive by our senses;
bearing in mind, however, what has been already said, that we must
only confide in this natural light so long as nothing contrary to
its dictates is revealed by God himself. [Footnote: The last clause,
beginning "bearing in mind." is omitted in the French.]

 XXIX. That God is not the cause of our errors.

The first attribute of God which here falls to be considered, is
that he is absolutely veracious and the source of all light, so that
it is plainly repugnant for him to deceive us, or to be properly and
positively the cause of the errors to which we are consciously
subject; for although the address to deceive seems to be some mark
of subtlety of mind among men, yet without doubt the will to deceive
only proceeds from malice or from fear and weakness, and
consequently cannot be attributed to God.

 XXX. That consequently all which we clearly perceive is true, and
that we are thus delivered from the doubts above proposed.

Whence it follows, that the light of nature, or faculty of knowledge
given us by God, can never compass any object which is not true, in
as far as it attains to a knowledge of it, that is, in as far as the
object is clearly and distinctly apprehended. For God would have
merited the appellation of a deceiver if he had given us this
faculty perverted, and such as might lead us to take falsity for
truth [when we used it aright]. Thus the highest doubt is removed,
which arose from our ignorance on the point as to whether perhaps
our nature was such that we might be deceived even in those things
that appear to us the most evident. The same principle ought also to
be of avail against all the other grounds of doubting that have been
already enumerated. For mathematical truths ought now to be above
suspicion, since these are of the clearest. And if we perceive
anything by our senses, whether while awake or asleep, we will
easily discover the truth provided we separate what there is of
clear and distinct in the knowledge from what is obscure and
confused. There is no need that I should here say more on this
subject, since it has already received ample treatment in the
metaphysical Meditations; and what follows will serve to explain it
still more accurately.

 XXXI. That our errors are, in respect of God, merely negations,
but, in respect of ourselves, privations.

But as it happens that we frequently fall into error, although God
is no deceiver, if we desire to inquire into the origin and cause of
our errors, with a view to guard against them, it is necessary to
observe that they depend less on our understanding than on our will,
and that they have no need of the actual concourse of God, in order
to their production; so that, when considered in reference to God,
they are merely negations, but in reference to ourselves,
privations.

 XXXII. That there are only two modes of thinking in us, viz., the
perception of the understanding and the action of the will.

For all the modes of thinking of which we are conscious may be
referred to two general classes, the one of which is the perception
or operation of the understanding, and the other the volition or
operation of the will. Thus, to perceive by the senses (SENTIRE), to
imagine, and to conceive things purely intelligible, are only
different modes of perceiving (PERCIP IENDI); but to desire, to be
averse from, to affirm, to deny, to doubt, are different modes of
willing.
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