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St. Thomas Aquinas
Summa Theologica

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  • FIRST PART (FP: QQ 1-119)
      • Aquin.: SMT FP Q[11] Out. Para. 1/1 - THE UNITY OF GOD (FOUR ARTICLES)
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Aquin.: SMT FP Q[11] Out. Para. 1/1 - THE UNITY OF GOD (FOUR ARTICLES)

After the foregoing, we consider the divine unity; concerning which
there are four points of inquiry:

(1) Whether "one" adds anything to "being"?

(2) Whether "one" and "many" are opposed to each other?

(3) Whether God is one?

(4) Whether He is in the highest degree one?


Aquin.: SMT FP Q[11] A[1] Thes. Para. 1/1

Whether "one" adds anything to "being"?

Aquin.: SMT FP Q[11] A[1] Obj. 1 Para. 1/1

OBJ 1: It seems that "one" adds something to "being." For everything is
in a determinate genus by addition to being, which penetrates all
"genera." But "one" is a determinate genus, for it is the principle of
number, which is a species of quantity. Therefore "one" adds something to
"being."

Aquin.: SMT FP Q[11] A[1] Obj. 2 Para. 1/1

OBJ 2: Further, what divides a thing common to all, is an addition to
it. But "being" is divided by "one" and by "many." Therefore "one" is an
addition to "being."

Aquin.: SMT FP Q[11] A[1] Obj. 3 Para. 1/1

OBJ 3: Further, if "one" is not an addition to "being," "one" and
"being" must have the same meaning. But it would be nugatory to call
"being" by the name of "being"; therefore it would be equally so to call
being "one." Now this is false. Therefore "one" is an addition to "being."

Aquin.: SMT FP Q[11] A[1] OTC Para. 1/1

On the contrary, Dionysius says (Div. Nom. 5, ult.): "Nothing which
exists is not in some way one," which would be false if "one" were an
addition to "being," in the sense of limiting it. Therefore "one" is not
an addition to "being."

Aquin.: SMT FP Q[11] A[1] Body Para. 1/1

I answer that, "One" does not add any reality to "being"; but is only a
negation of division; for "one" means undivided "being." This is the very
reason why "one" is the same as "being." Now every being is either simple
or compound. But what is simple is undivided, both actually and
potentially. Whereas what is compound, has not being whilst its parts are
divided, but after they make up and compose it. Hence it is manifest that
the being of anything consists in undivision; and hence it is that
everything guards its unity as it guards its being.

Aquin.: SMT FP Q[11] A[1] R.O. 1 Para. 1/1

Reply OBJ 1: Some, thinking that the "one" convertible with "being" is
the same as the "one" which is the principle of number, were divided into
contrary opinions. Pythagoras and Plato, seeing that the "one"
convertible with "being" did not add any reality to "being," but
signified the substance of "being" as undivided, thought that the same
applied to the "one" which is the principle of number. And because number
is composed of unities, they thought that numbers were the substances of
all things. Avicenna, however, on the contrary, considering that "one"
which is the principle of number, added a reality to the substance of
"being" (otherwise number made of unities would not be a species of
quantity), thought that the "one" convertible with "being" added a
reality to the substance of beings; as "white" to "man." This, however,
is manifestly false, inasmuch as each thing is "one" by its substance.
For if a thing were "one" by anything else but by its substance, since
this again would be "one," supposing it were again "one" by another
thing, we should be driven on to infinity. Hence we must adhere to the
former statement; therefore we must say that the "one" which is
convertible with "being," does not add a reality to being; but that the
"one" which is the principle of number, does add a reality to "being,"
belonging to the genus of quantity.

Aquin.: SMT FP Q[11] A[1] R.O. 2 Para. 1/1

Reply OBJ 2: There is nothing to prevent a thing which in one way is
divided, from being another way undivided; as what is divided in number,
may be undivided in species; thus it may be that a thing is in one way
"one," and in another way "many." Still, if it is absolutely undivided,
either because it is so according to what belongs to its essence, though
it may be divided as regards what is outside its essence, as what is one
in subject may have many accidents; or because it is undivided actually,
and divided potentially, as what is "one" in the whole, and is "many" in
parts; in such a case a thing will be "one" absolutely and "many"
accidentally. On the other hand, if it be undivided accidentally, and
divided absolutely, as if it were divided in essence and undivided in
idea or in principle or cause, it will be "many" absolutely and "one"
accidentally; as what are "many" in number and "one" in species or "one"
in principle. Hence in that way, being is divided by "one" and by "many";
as it were by "one" absolutely and by "many" accidentally. For multitude
itself would not be contained under "being," unless it were in some way
contained under "one." Thus Dionysius says (Div. Nom. cap. ult.) that
"there is no kind of multitude that is not in a way one. But what are
many in their parts, are one in their whole; and what are many in
accidents, are one in subject; and what are many in number, are one in
species; and what are many in species, are one in genus; and what are
many in processions, are one in principle."

Aquin.: SMT FP Q[11] A[1] R.O. 3 Para. 1/1

Reply OBJ 3: It does not follow that it is nugatory to say "being" is
"one"; forasmuch as "one" adds an idea to "being."


Aquin.: SMT FP Q[11] A[2] Thes. Para. 1/1

Whether "one" and "many" are opposed to each other?

Aquin.: SMT FP Q[11] A[2] Obj. 1 Para. 1/1

OBJ 1: It seems that "one" and "many" are not mutually opposed. For no
opposite thing is predicated of its opposite. But every "multitude" is in
a certain way "one," as appears from the preceding article. Therefore
"one" is not opposed to "multitude."

Aquin.: SMT FP Q[11] A[2] Obj. 2 Para. 1/1

OBJ 2: Further, no opposite thing is constituted by its opposite. But
"multitude" is constituted by "one." Therefore it is not opposed to
"multitude."

Aquin.: SMT FP Q[11] A[2] Obj. 3 Para. 1/1

OBJ 3: Further, "one" is opposed to "one." But the idea of "few" is
opposed to "many." Therefore "one" is not opposed to "many."

Aquin.: SMT FP Q[11] A[2] Obj. 4 Para. 1/1

OBJ 4: Further, if "one" is opposed to "multitude," it is opposed as the
undivided is to the divided; and is thus opposed to it as privation is to
habit. But this appears to be incongruous; because it would follow that
"one" comes after "multitude," and is defined by it; whereas, on the
contrary, "multitude" is defined by "one." Hence there would be a vicious
circle in the definition; which is inadmissible. Therefore "one" and
"many" are not opposed.

Aquin.: SMT FP Q[11] A[2] OTC Para. 1/1

On the contrary, Things which are opposed in idea, are themselves
opposed to each other. But the idea of "one" consists in indivisibility;
and the idea of "multitude" contains division. Therefore "one" and
"many" are opposed to each other.

Aquin.: SMT FP Q[11] A[2] Body Para. 1/1

I answer that, "One" is opposed to "many," but in various ways. The
"one" which is the principle of number is opposed to "multitude" which is
number, as the measure is to the thing measured. For "one" implies the
idea of a primary measure; and number is "multitude" measured by "one,"
as is clear from Metaph. x. But the "one" which convertible with "being"
is opposed to "multitude" by way of privation; as the undivided is to the
thing divided.

Aquin.: SMT FP Q[11] A[2] R.O. 1 Para. 1/1

Reply OBJ 1: No privation entirely takes away the being of a thing,
inasmuch as privation means "negation in the subject," according to the
Philosopher (Categor. viii). Nevertheless every privation takes away some
being; and so in being, by reason of its universality, the privation of
being has its foundation in being; which is not the case in privations of
special forms, as of sight, or of whiteness and the like. And what
applies to being applies also to one and to good, which are convertible
with being, for the privation of good is founded in some good; likewise
the removal of unity is founded in some one thing. Hence it happens that
multitude is some one thing; and evil is some good thing, and non-being
is some kind of being. Nevertheless, opposite is not predicated of
opposite; forasmuch as one is absolute, and the other is relative; for
what is relative being (as a potentiality) is non-being absolutely, i.e.
actually; or what is absolute being in the genus of substance is
non-being relatively as regards some accidental being. In the same way,
what is relatively good is absolutely bad, or vice versa; likewise what
is absolutely "one" is relatively "many," and vice versa.

Aquin.: SMT FP Q[11] A[2] R.O. 2 Para. 1/1

Reply OBJ 2: A "whole" is twofold. In one sense it is homogeneous,
composed of like parts; in another sense it is heterogeneous, composed of
dissimilar parts. Now in every homogeneous whole, the whole is made up of
parts having the form of the whole; as, for instance, every part of water
is water; and such is the constitution of a continuous thing made up of
its parts. In every heterogeneous whole, however, every part is wanting
in the form belonging to the whole; as, for instance, no part of a house
is a house, nor is any part of a man a man. Now multitude is such a kind
of a whole. Therefore inasmuch as its part has not the form of the
multitude, the latter is composed of unities, as a house is composed of
not houses; not, indeed, as if unities constituted multitude so far as
they are undivided, in which way they are opposed to multitude; but so
far as they have being, as also the parts of a house make up the house by
the fact that they are beings, not by the fact that they are not houses.

Aquin.: SMT FP Q[11] A[2] R.O. 3 Para. 1/1

Reply OBJ 3: "Many" is taken in two ways: absolutely, and in that sense
it is opposed to "one"; in another way as importing some kind of excess,
in which sense it is opposed to "few"; hence in the first sense two are
many but not in the second sense.

Aquin.: SMT FP Q[11] A[2] R.O. 4 Para. 1/1

Reply OBJ 4: "One" is opposed to "many" privatively, inasmuch as the
idea of "many" involves division. Hence division must be prior to unity,
not absolutely in itself, but according to our way of apprehension. For
we apprehend simple things by compound things; and hence we define a point to be, "what has no part," or "the beginning of a line."
"Multitude" also, in idea, follows on "one"; because we do not understand
divided things to convey the idea of multitude except by the fact that we
attribute unity to every part. Hence "one" is placed in the definition of
"multitude"; but "multitude" is not placed in the definition of "one."
But division comes to be understood from the very negation of being: so
what first comes to mind is being; secondly, that this being is not that
being, and thus we apprehend division as a consequence; thirdly, comes
the notion of one; fourthly, the notion of multitude.


Aquin.: SMT FP Q[11] A[3] Thes. Para. 1/1

Whether God is one?

Aquin.: SMT FP Q[11] A[3] Obj. 1 Para. 1/1

OBJ 1: It seems that God is not one. For it is written "For there be
many gods and many lords" (1 Cor. 8:5).

Aquin.: SMT FP Q[11] A[3] Obj. 2 Para. 1/1

OBJ 2: Further, "One," as the principle of number, cannot be predicated
of God, since quantity is not predicated of God; likewise, neither can
"one" which is convertible with "being" be predicated of God, because it
imports privation, and every privation is an imperfection, which cannot
apply to God. Therefore God is not one.

Aquin.: SMT FP Q[11] A[3] OTC Para. 1/1

On the contrary, It is written "Hear, O Israel, the Lord our God is one
Lord" (Dt. 6:4).

Aquin.: SMT FP Q[11] A[3] Body Para. 1/3

I answer that, It can be shown from these three sources that God is one.
First from His simplicity. For it is manifest that the reason why any
singular thing is "this particular thing" is because it cannot be
communicated to many: since that whereby Socrates is a man, can be
communicated to many; whereas, what makes him this particular man, is
only communicable to one. Therefore, if Socrates were a man by what makes
him to be this particular man, as there cannot be many Socrates, so there
could not in that way be many men. Now this belongs to God alone; for God
Himself is His own nature, as was shown above (Q[3], A[3]). Therefore, in
the very same way God is God, and He is this God. Impossible is it
therefore that many Gods should exist.

Aquin.: SMT FP Q[11] A[3] Body Para. 2/3

Secondly, this is proved from the infinity of His perfection. For it was
shown above (Q[4], A[2]) that God comprehends in Himself the whole
perfection of being. If then many gods existed, they would necessarily
differ from each other. Something therefore would belong to one which did
not belong to another. And if this were a privation, one of them would
not be absolutely perfect; but if a perfection, one of them would be
without it. So it is impossible for many gods to exist. Hence also the
ancient philosophers, constrained as it were by truth, when they asserted
an infinite principle, asserted likewise that there was only one such
principle.

Aquin.: SMT FP Q[11] A[3] Body Para. 3/3

Thirdly, this is shown from the unity of the world. For all things that
exist are seen to be ordered to each other since some serve others. But
things that are diverse do not harmonize in the same order, unless they
are ordered thereto by one. For many are reduced into one order by one
better than by many: because one is the "per se" cause of one, and many
are only the accidental cause of one, inasmuch as they are in some way
one. Since therefore what is first is most perfect, and is so "per se"
and not accidentally, it must be that the first which reduces all into
one order should be only one. And this one is God.

Aquin.: SMT FP Q[11] A[3] R.O. 1 Para. 1/1

Reply OBJ 1: Gods are called many by the error of some who worshipped
many deities, thinking as they did that the planets and other stars were
gods, and also the separate parts of the world. Hence the Apostle adds:
"Our God is one," etc.

Aquin.: SMT FP Q[11] A[3] R.O. 2 Para. 1/1

Reply OBJ 2: "One" which is the principle of number is not predicated of
God, but only of material things. For "one" the principle of number
belongs to the "genus" of mathematics, which are material in being, and
abstracted from matter only in idea. But "one" which is convertible with
being is a metaphysical entity and does not depend on matter in its
being. And although in God there is no privation, still, according to the
mode of our apprehension, He is known to us by way only of privation and
remotion. Thus there is no reason why a certain kind of privation should
not be predicated of God; for instance, that He is incorporeal and
infinite; and in the same way it is said of God that He is one.


Aquin.: SMT FP Q[11] A[4] Thes. Para. 1/1

Whether God is supremely one?

Aquin.: SMT FP Q[11] A[4] Obj. 1 Para. 1/1

OBJ 1: It seems that God is not supremely "one." For "one" is so called
from the privation of division. But privation cannot be greater or less.
Therefore God is not more "one" than other things which are called "one."

Aquin.: SMT FP Q[11] A[4] Obj. 2 Para. 1/1

OBJ 2: Further, nothing seems to be more indivisible than what is
actually and potentially indivisible; such as a point and unity. But a
thing is said to be more "one" according as it is indivisible. Therefore
God is not more "one" than unity is "one" and a point is "one."

Aquin.: SMT FP Q[11] A[4] Obj. 3 Para. 1/1

OBJ 3: Further, what is essentially good is supremely good. Therefore
what is essentially "one" is supremely "one." But every being is
essentially "one," as the Philosopher says (Metaph. iv). Therefore every being is supremely "one"; and therefore God is not "one" more than any
other being is "one."

Aquin.: SMT FP Q[11] A[4] OTC Para. 1/1

On the contrary, Bernard says (De Consid. v): "Among all things called
one, the unity of the Divine Trinity holds the first place."

Aquin.: SMT FP Q[11] A[4] Body Para. 1/1

I answer that, Since "one" is an undivided being, if anything is
supremely "one" it must be supremely being, and supremely undivided. Now
both of these belong to God. For He is supremely being, inasmuch as His
being is not determined by any nature to which it is adjoined; since He
is being itself, subsistent, absolutely undetermined. But He is supremely
undivided inasmuch as He is divided neither actually nor potentially, by
any mode of division; since He is altogether simple, as was shown above
(Q[3], A[7]). Hence it is manifest that God is "one" in the supreme
degree.

Aquin.: SMT FP Q[11] A[4] R.O. 1 Para. 1/1

Reply OBJ 1: Although privation considered in itself is not susceptive
of more or less, still according as its opposite is subject to more or less, privation also can be considered itself in the light of more and
less. Therefore according as a thing is more divided, or is divisible,
either less or not at all, in the degree it is called more, or less, or
supremely, "one."

Aquin.: SMT FP Q[11] A[4] R.O. 2 Para. 1/1

Reply OBJ 2: A point and unity which is the principle of number, are not
supremely being, inasmuch as they have being only in some subject. Hence
neither of them can be supremely "one." For as a subject cannot be
supremely "one," because of the difference within it of accident and
subject, so neither can an accident.

Aquin.: SMT FP Q[11] A[4] R.O. 3 Para. 1/1

Reply OBJ 3: Although every being is "one" by its substance, still every
such substance is not equally the cause of unity; for the substance of
some things is compound and of others simple.





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