Thomas Aquinas - Summa Theologica, Part I (Prima Pars)

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_I answer that,_ In God there exists the most perfect knowledge. To
prove this, we must note that intelligent beings are distinguished
from non-intelligent beings in that the latter possess only their own
form; whereas the intelligent being is naturally adapted to have also
the form of some other thing; for the idea of the thing known is in
the knower. Hence it is manifest that the nature of a non-intelligent
being is more contracted and limited; whereas the nature of
intelligent beings has a greater amplitude and extension; therefore
the Philosopher says (De Anima iii) that "the soul is in a sense all
things." Now the contraction of the form comes from the matter. Hence,
as we have said above (Q. 7, A. 1) forms according as they are the
more immaterial, approach more nearly to a kind of infinity. Therefore
it is clear that the immateriality of a thing is the reason why it is
cognitive; and according to the mode of immateriality is the mode of
knowledge. Hence it is said in _De Anima_ ii that plants do not know,
because they are wholly material. But sense is cognitive because it
can receive images free from matter, and the intellect is still
further cognitive, because it is more separated from matter and
unmixed, as said in _De Anima_ iii. Since therefore God is in the
highest degree of immateriality as stated above (Q. 7, A. 1), it
follows that He occupies the highest place in knowledge.

Reply Obj. 1: Because perfections flowing from God to creatures exist
in a higher state in God Himself (Q. 4, A. 2), whenever a name taken
from any created perfection is attributed to God, it must be
separated in its signification from anything that belongs to that
imperfect mode proper to creatures. Hence knowledge is not a quality
of God, nor a habit; but substance and pure act.

Reply Obj. 2: Whatever is divided and multiplied in creatures exists
in God simply and unitedly (Q. 13, A. 4). Now man has different kinds
of knowledge, according to the different objects of His knowledge. He
has _intelligence_ as regards the knowledge of principles; he has
_science_ as regards knowledge of conclusions; he has _wisdom,_
according as he knows the highest cause; he has _counsel_ or
_prudence,_ according as he knows what is to be done. But God knows
all these by one simple act of knowledge, as will be shown (A. 7).
Hence the simple knowledge of God can be named by all these names; in
such a way, however, that there must be removed from each of them, so
far as they enter into divine predication, everything that savors of
imperfection; and everything that expresses perfection is to be
retained in them. Hence it is said, "With Him is wisdom and strength,
He hath counsel and understanding" (Job 12:13).

Reply Obj. 3: Knowledge is according to the mode of the one who
knows; for the thing known is in the knower according to the mode of
the knower. Now since the mode of the divine essence is higher than
that of creatures, divine knowledge does not exist in God after the
mode of created knowledge, so as to be universal or particular, or
habitual, or potential, or existing according to any such mode.
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SECOND ARTICLE [I, Q. 14, Art. 2]

Whether God Understands Himself?

Objection 1: It seems that God does not understand Himself. For it is
said by the Philosopher (De Causis), "Every knower who knows his own
essence, returns completely to his own essence." But God does not go
out from His own essence, nor is He moved at all; thus He cannot
return to His own essence. Therefore He does not know His own essence.

Obj. 2: Further, to understand is a kind of passion and movement,
as the Philosopher says (De Anima iii); and knowledge also is a kind
of assimilation to the object known; and the thing known is the
perfection of the knower. But nothing is moved, or suffers, or is made
perfect by itself, "nor," as Hilary says (De Trin. iii), "is a thing
its own likeness." Therefore God does not understand Himself.

Obj. 3: Further, we are like to God chiefly in our intellect,
because we are the image of God in our mind, as Augustine says (Gen.
ad lit. vi). But our intellect understands itself, only as it
understands other things, as is said in _De Anima_ iii. Therefore God
understands Himself only so far perchance as He understands other
things.

_On the contrary,_ It is written: "The things that are of God no man
knoweth, but the Spirit of God" (1 Cor. 2:11).

_I answer that,_ God understands Himself through Himself. In proof
whereof it must be known that although in operations which pass to an
external effect, the object of the operation, which is taken as the
term, exists outside the operator; nevertheless in operations that
remain in the operator, the object signified as the term of operation,
resides in the operator; and accordingly as it is in the operator, the
operation is actual. Hence the Philosopher says (De Anima iii) that
"the sensible in act is sense in act, and the intelligible in act is
intellect in act." For the reason why we actually feel or know a thing
is because our intellect or sense is actually informed by the sensible
or intelligible species. And because of this only, it follows that
sense or intellect is distinct from the sensible or intelligible
object, since both are in potentiality.

Since therefore God has nothing in Him of potentiality, but is pure
act, His intellect and its object are altogether the same; so that He
neither is without the intelligible species, as is the case with our
intellect when it understands potentially; nor does the intelligible
species differ from the substance of the divine intellect, as it
differs in our intellect when it understands actually; but the
intelligible species itself is the divine intellect itself, and thus
God understands Himself through Himself.

Reply Obj. 1: Return to its own essence means only that a thing
subsists in itself. Inasmuch as the form perfects the matter by
giving it existence, it is in a certain way diffused in it; and it
returns to itself inasmuch as it has existence in itself. Therefore
those cognitive faculties which are not subsisting, but are the acts
of organs, do not know themselves, as in the case of each of the
senses; whereas those cognitive faculties which are subsisting, know
themselves; hence it is said in _De Causis_ that, "whoever knows his
essence returns to it." Now it supremely belongs to God to be
self-subsisting. Hence according to this mode of speaking, He
supremely returns to His own essence, and knows Himself.

Reply Obj. 2: Movement and passion are taken equivocally, according
as to understand is described as a kind of movement or passion, as
stated in _De Anima_ iii. For to understand is not a movement that is
an act of something imperfect passing from one to another, but it is
an act, existing in the agent itself, of something perfect. Likewise
that the intellect is perfected by the intelligible object, i.e. is
assimilated to it, this belongs to an intellect which is sometimes in
potentiality; because the fact of its being in a state of
potentiality makes it differ from the intelligible object and
assimilates it thereto through the intelligible species, which is the
likeness of the thing understood, and makes it to be perfected
thereby, as potentiality is perfected by act. On the other hand, the
divine intellect, which is no way in potentiality, is not perfected
by the intelligible object, nor is it assimilated thereto, but is its
own perfection, and its own intelligible object.

Reply Obj. 3: Existence in nature does not belong to primary matter,
which is a potentiality, unless it is reduced to act by a form. Now
our passive intellect has the same relation to intelligible objects
as primary matter has to natural things; for it is in potentiality as
regards intelligible objects, just as primary matter is to natural
things. Hence our passive intellect can be exercised concerning
intelligible objects only so far as it is perfected by the
intelligible species of something; and in that way it understands
itself by an intelligible species, as it understands other things:
for it is manifest that by knowing the intelligible object it
understands also its own act of understanding, and by this act knows
the intellectual faculty. But God is a pure act in the order of
existence, as also in the order of intelligible objects; therefore He
understands Himself through Himself.
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THIRD ARTICLE [I, Q. 14, Art. 3]

Whether God Comprehends Himself?

Objection 1: It seems that God does not comprehend Himself. For
Augustine says (Octog. Tri. Quaest. xv), that "whatever comprehends
itself is finite as regards itself." But God is in all ways infinite.
Therefore He does not comprehend Himself.

Obj. 2: If it is said that God is infinite to us, and finite to
Himself, it can be urged to the contrary, that everything in God is
truer than it is in us. If therefore God is finite to Himself, but
infinite to us, then God is more truly finite than infinite; which is
against what was laid down above (Q. 7, A. 1). Therefore God does
not comprehend Himself.

_On the contrary,_ Augustine says (Octog. Tri. Quaest. xv), that
"Everything that understands itself, comprehends itself." But God
understands Himself. Therefore He comprehends Himself.

_I answer that,_ God perfectly comprehends Himself, as can be thus
proved. A thing is said to be comprehended when the end of the
knowledge of it is attained, and this is accomplished when it is known
as perfectly as it is knowable; as, for instance, a demonstrable
proposition is comprehended when known by demonstration, not, however,
when it is known by some probable reason. Now it is manifest that God
knows Himself as perfectly as He is perfectly knowable. For everything
is knowable according to the mode of its own actuality; since a thing
is not known according as it is in potentiality, but in so far as it
is in actuality, as said in _Metaph._ ix. Now the power of God in
knowing is as great as His actuality in existing; because it is from
the fact that He is in act and free from all matter and potentiality,
that God is cognitive, as shown above (AA. 1, 2). Whence it is
manifest that He knows Himself as much as He is knowable; and for that
reason He perfectly comprehends Himself.

Reply Obj. 1: The strict meaning of "comprehension" signifies that
one thing holds and includes another; and in this sense everything
comprehended is finite, as also is everything included in another.
But God is not said to be comprehended by Himself in this sense, as
if His intellect were a faculty apart from Himself, and as if it held
and included Himself; for these modes of speaking are to be taken by
way of negation. But as God is said to be in Himself, forasmuch as He
is not contained by anything outside of Himself; so He is said to be
comprehended by Himself, forasmuch as nothing in Himself is hidden
from Himself. For Augustine says (De Vid. Deum. ep. cxii), "The whole
is comprehended when seen, if it is seen in such a way that nothing
of it is hidden from the seer."

Reply Obj. 2: When it is said, "God is finite to Himself," this is to
be understood according to a certain similitude of proportion,
because He has the same relation in not exceeding His intellect, as
anything finite has in not exceeding finite intellect. But God is not
to be called finite to Himself in this sense, as if He understood
Himself to be something finite.
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FOURTH ARTICLE [I, Q. 14, Art. 4]

Whether the Act of God's Intellect Is His Substance?

Objection 1: It seems that the act of God's intellect is not His
substance. For to understand is an operation. But an operation
signifies something proceeding from the operator. Therefore the act of
God's intellect is not His substance.

Obj. 2: Further, to understand one's act of understanding, is to
understand something that is neither great nor chiefly understood,
but secondary and accessory. If therefore God be his own act of
understanding, His act of understanding will be as when we understand
our act of understanding: and thus God's act of understanding will not
be something great.

Obj. 3: Further, every act of understanding means understanding
something. When therefore God understands Himself, if He Himself is
not distinct from this act of understanding, He understands that He
understands Himself; and so on to infinity. Therefore the act of God's
intellect is not His substance.

_On the contrary,_ Augustine says (De Trin. vii), "In God to be is
the same as to be wise." But to be wise is the same thing as to
understand. Therefore in God to be is the same thing as to
understand. But God's existence is His substance, as shown above
(Q. 3, A. 4). Therefore the act of God's intellect is His substance.

_I answer that,_ It must be said that the act of God's intellect is
His substance. For if His act of understanding were other than His
substance, then something else, as the Philosopher says (Metaph.
xii), would be the act and perfection of the divine substance, to
which the divine substance would be related, as potentiality is to
act, which is altogether impossible; because the act of understanding
is the perfection and act of the one understanding. Let us now
consider how this is. As was laid down above (A. 2), to understand is
not an act passing to anything extrinsic; for it remains in the
operator as his own act and perfection; as existence is the
perfection of the one existing: just as existence follows on the
form, so in like manner to understand follows on the intelligible
species. Now in God there is no form which is something other than
His existence, as shown above (Q. 3). Hence as His essence itself is
also His intelligible species, it necessarily follows that His act of
understanding must be His essence and His existence.

Thus it follows from all the foregoing that in God, intellect, and
the object understood, and the intelligible species, and His act of
understanding are entirely one and the same. Hence when God is said
to be understanding, no kind of multiplicity is attached to His
substance.

Reply Obj. 1: To understand is not an operation proceeding out of the
operator, but remaining in him.

Reply Obj. 2: When that act of understanding which is not subsistent
is understood, something not great is understood; as when we
understand our act of understanding; and so this cannot be likened to
the act of the divine understanding which is subsistent.

Thus appears the Reply to the Third Objection. For the act of divine
understanding subsists in itself, and belongs to its very self and is
not another's; hence it need not proceed to infinity.
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FIFTH ARTICLE [I, Q. 14, Art. 5]

Whether God Knows Things Other Than Himself?

Objection 1: It seems that God does not know things besides Himself.
For all other things but God are outside of God. But Augustine says
(Octog. Tri. Quaest. qu. xlvi) that "God does not behold anything out
of Himself." Therefore He does not know things other than Himself.

Obj. 2: Further, the object understood is the perfection of the one
who understands. If therefore God understands other things besides
Himself, something else will be the perfection of God, and will be
nobler than He; which is impossible.

Obj. 3: Further, the act of understanding is specified by the
intelligible object, as is every other act from its own object. Hence
the intellectual act is so much the nobler, the nobler the object
understood. But God is His own intellectual act. If therefore God
understands anything other than Himself, then God Himself is specified
by something else than Himself; which cannot be. Therefore He does not
understand things other than Himself.

_On the contrary,_ It is written: "All things are naked and open to His
eyes" (Heb. 4:13).

_I answer that,_ God necessarily knows things other than Himself. For
it is manifest that He perfectly understands Himself; otherwise His
existence would not be perfect, since His existence is His act of
understanding. Now if anything is perfectly known, it follows of
necessity that its power is perfectly known. But the power of
anything can be perfectly known only by knowing to what its power
extends. Since therefore the divine power extends to other things by
the very fact that it is the first effective cause of all things, as
is clear from the aforesaid (Q. 2, A. 3), God must necessarily know
things other than Himself. And this appears still more plainly if we
add that the very existence of the first effective cause--viz.
God--is His own act of understanding. Hence whatever effects
pre-exist in God, as in the first cause, must be in His act of
understanding, and all things must be in Him according to an
intelligible mode: for everything which is in another, is in it
according to the mode of that in which it is.

Now in order to know how God knows things other than Himself, we must
consider that a thing is known in two ways: in itself, and in another.
A thing is known in itself when it is known by the proper species
adequate to the knowable object; as when the eye sees a man through
the image of a man. A thing is seen in another through the image of
that which contains it; as when a part is seen in the whole by the
image of the whole; or when a man is seen in a mirror by the image in
the mirror, or by any other mode by which one thing is seen in
another.

So we say that God sees Himself in Himself, because He sees Himself
through His essence; and He sees other things not in themselves, but
in Himself; inasmuch as His essence contains the similitude of things
other than Himself.

Reply Obj. 1: The passage of Augustine in which it is said that God
"sees nothing outside Himself" is not to be taken in such a way, as
if God saw nothing outside Himself, but in the sense that what is
outside Himself He does not see except in Himself, as above explained.

Reply Obj. 2: The object understood is a perfection of the one
understanding not by its substance, but by its image, according to
which it is in the intellect, as its form and perfection, as is said
in _De Anima_ iii. For "a stone is not in the soul, but its image."
Now those things which are other than God are understood by God,
inasmuch as the essence of God contains their images as above
explained; hence it does not follow that there is any perfection in
the divine intellect other than the divine essence.

Reply Obj. 3: The intellectual act is not specified by what is
understood in another, but by the principal object understood in which
other things are understood. For the intellectual act is specified by
its object, inasmuch as the intelligible form is the principle of the
intellectual operation: since every operation is specified by the form
which is its principle of operation; as heating by heat. Hence the
intellectual operation is specified by that intelligible form which
makes the intellect in act. And this is the image of the principal
thing understood, which in God is nothing but His own essence in which
all images of things are comprehended. Hence it does not follow that
the divine intellectual act, or rather God Himself, is specified by
anything else than the divine essence itself.
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SIXTH ARTICLE [I, Q. 14, Art. 6]

Whether God Knows Things Other Than Himself by Proper Knowledge?

Objection 1: It seems that God does not know things other than
Himself by proper knowledge. For, as was shown (A. 5), God knows
things other than Himself, according as they are in Himself. But
other things are in Him as in their common and universal cause, and
are known by God as in their first and universal cause. This is to
know them by general, and not by proper knowledge. Therefore God
knows things besides Himself by general, and not by proper knowledge.

Obj. 2: Further, the created essence is as distant from the divine
essence, as the divine essence is distant from the created essence.
But the divine essence cannot be known by the created essence, as
said above (Q. 12, A. 2). Therefore neither can the created essence
be known by the divine essence. Thus as God knows only by His
essence, it follows that He does not know what the creature is in its
essence, so as to know "what it is," which is to have proper
knowledge of it.

Obj. 3: Further, proper knowledge of a thing can come only through
its proper ratio [i.e., concept]. But as God knows all things by His
essence, it seems that He does not know each thing by its proper
ratio; for one thing cannot be the proper ratio of many and diverse
things. Therefore God has not a proper knowledge of things, but a
general knowledge; for to know things otherwise than by their proper
ratio is to have only a common and general knowledge of them.

_On the contrary,_ To have a proper knowledge of things is to know them
not only in general, but as they are distinct from each other. Now God
knows things in that manner. Hence it is written that He reaches "even
to the division of the soul and the spirit, of the joints also and the
marrow, and is a discerner of thoughts and intents of the heart;
neither is there any creature invisible in His sight" (Heb. 4:12,13).

_I answer that,_ Some have erred on this point, saying that God knows
things other than Himself only in general, that is, only as beings.
For as fire, if it knew itself as the principle of heat, would know
the nature of heat, and all things else in so far as they are hot; so
God, through knowing Himself as the principle of being, knows the
nature of being, and all other things in so far as they are beings.

But this cannot be. For to know a thing in general and not in
particular, is to have an imperfect knowledge. Hence our intellect,
when it is reduced from potentiality to act, acquires first a
universal and confused knowledge of things, before it knows them in
particular; as proceeding from the imperfect to the perfect, as is
clear from _Phys._ i. If therefore the knowledge of God regarding things
other than Himself is only universal and not special, it would follow
that His understanding would not be absolutely perfect; therefore
neither would His being be perfect; and this is against what was said
above (Q. 4, A. 1). We must therefore hold that God knows things
other than Himself with a proper knowledge; not only in so far as
being is common to them, but in so far as one is distinguished from
the other. In proof thereof we may observe that some wishing to show
that God knows many things by one, bring forward some examples, as,
for instance, that if the centre knew itself, it would know all lines
that proceed from the centre; or if light knew itself, it would know
all colors.

Now these examples although they are similar in part, namely, as
regards universal causality, nevertheless they fail in this respect,
that multitude and diversity are caused by the one universal
principle, not as regards that which is the principle of distinction,
but only as regards that in which they communicate. For the diversity
of colors is not caused by the light only, but by the different
disposition of the diaphanous medium which receives it; and likewise,
the diversity of the lines is caused by their different position.
Hence it is that this kind of diversity and multitude cannot be known
in its principle by proper knowledge, but only in a general way. In
God, however, it is otherwise. For it was shown above (Q. 4, A. 2)
that whatever perfection exists in any creature, wholly pre-exists and
is contained in God in an excelling manner. Now not only what is
common to creatures--viz. being--belongs to their perfection, but
also what makes them distinguished from each other; as living and
understanding, and the like, whereby living beings are distinguished
from the non-living, and the intelligent from the non-intelligent.
Likewise every form whereby each thing is constituted in its own
species, is a perfection; and thus all things pre-exist in God, not
only as regards what is common to all, but also as regards what
distinguishes one thing from another. And therefore as God contains
all perfections in Himself, the essence of God is compared to all
other essences of things, not as the common to the proper, as unity is
to numbers, or as the centre (of a circle) to the (radiating) lines;
but as perfect acts to imperfect; as if I were to compare man to
animal; or six, a perfect number, to the imperfect numbers contained
under it. Now it is manifest that by a perfect act imperfect acts can
be known not only in general, but also by proper knowledge; thus, for
example, whoever knows a man, knows an animal by proper knowledge; and
whoever knows the number six, knows the number three also by proper
knowledge.

As therefore the essence of God contains in itself all the perfection
contained in the essence of any other being, and far more, God can
know in Himself all of them with proper knowledge. For the nature
proper to each thing consists in some degree of participation in the
divine perfection. Now God could not be said to know Himself perfectly
unless He knew all the ways in which His own perfection can be shared
by others. Neither could He know the very nature of being perfectly,
unless He knew all modes of being. Hence it is manifest that God knows
all things with proper knowledge, in their distinction from each
other.