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St. Thomas Aquinas
Summa Theologica

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  • FIRST PART (FP: QQ 1-119)
      • Aquin.: SMT FP Q[39] Out. Para. 1/2 - OF THE PERSONS IN RELATION TO THE ESSENCE (EIGHT ARTICLES)
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Aquin.: SMT FP Q[39] Out. Para. 1/2 - OF THE PERSONS IN RELATION TO THE ESSENCE (EIGHT ARTICLES)

Those things considered which belong to the divine persons absolutely,
we next treat of what concerns the person in reference to the essence, to
the properties, and to the notional acts; and of the comparison of these
with each other.

Aquin.: SMT FP Q[39] Out. Para. 2/2
As regards the first of these, there are eight points of inquiry:

(1) Whether the essence in God is the same as the person?

(2) Whether we should say that the three persons are of one essence?

(3) Whether essential names should be predicated of the persons in the
plural, or in the singular?

(4) Whether notional adjectives, or verbs, or participles, can be
predicated of the essential names taken in a concrete sense?

(5) Whether the same can be predicated of essential names taken in the
abstract?

(6) Whether the names of the persons can be predicated of concrete
essential names?

(7) Whether essential attributes can be appropriated to the persons?

(8) Which attributes should be appropriated to each person?


Aquin.: SMT FP Q[39] A[1] Thes. Para. 1/1

Whether in God the essence is the same as the person?

Aquin.: SMT FP Q[39] A[1] Obj. 1 Para. 1/1

OBJ 1: It would seem that in God the essence is not the same as person.
For whenever essence is the same as person or "suppositum," there can be
only one "suppositum" of one nature, as is clear in the case of all
separate substances. For in those things which are really one and the
same, one cannot be multiplied apart from the other. But in God there is
one essence and three persons, as is clear from what is above expounded
(Q[28], A[3]; Q[30], A[2]). Therefore essence is not the same as person.

Aquin.: SMT FP Q[39] A[1] Obj. 2 Para. 1/1

OBJ 2: Further, simultaneous affirmation and negation of the same things
in the same respect cannot be true. But affirmation and negation are true
of essence and of person. For person is distinct, whereas essence is not.
Therefore person and essence are not the same.

Aquin.: SMT FP Q[39] A[1] Obj. 3 Para. 1/1

OBJ 3: Further, nothing can be subject to itself. But person is subject
to essence; whence it is called "suppositum" or "hypostasis." Therefore
person is not the same as essence.

Aquin.: SMT FP Q[39] A[1] OTC Para. 1/1

On the contrary, Augustine says (De Trin. vi, 7): "When we say the
person of the Father we mean nothing else but the substance of the
Father."

Aquin.: SMT FP Q[39] A[1] Body Para. 1/1

I answer that, The truth of this question is quite clear if we consider
the divine simplicity. For it was shown above (Q[3], A[3]) that the
divine simplicity requires that in God essence is the same as
"suppositum," which in intellectual substances is nothing else than
person. But a difficulty seems to arise from the fact that while the
divine persons are multiplied, the essence nevertheless retains its
unity. And because, as Boethius says (De Trin. i), "relation multiplies
the Trinity of persons," some have thought that in God essence and person
differ, forasmuch as they held the relations to be "adjacent";
considering only in the relations the idea of "reference to another," and
not the relations as realities. But as it was shown above (Q[28], A[2])
in creatures relations are accidental, whereas in God they are the divine
essence itself. Thence it follows that in God essence is not really
distinct from person; and yet that the persons are really distinguished
from each other. For person, as above stated (Q[29], A[4]), signifies
relation as subsisting in the divine nature. But relation as referred to
the essence does not differ therefrom really, but only in our way of
thinking; while as referred to an opposite relation, it has a real
distinction by virtue of that opposition. Thus there are one essence and
three persons.

Aquin.: SMT FP Q[39] A[1] R.O. 1 Para. 1/1

Reply OBJ 1: There cannot be a distinction of "suppositum" in creatures
by means of relations, but only by essential principles; because in
creatures relations are not subsistent. But in God relations are
subsistent, and so by reason of the opposition between them they
distinguish the "supposita"; and yet the essence is not distinguished,
because the relations themselves are not distinguished from each other so
far as they are identified with the essence.

Aquin.: SMT FP Q[39] A[1] R.O. 2 Para. 1/1

Reply OBJ 2: As essence and person in God differ in our way of thinking,
it follows that something can be denied of the one and affirmed of the
other; and therefore, when we suppose the one, we need not suppose the
other.

Aquin.: SMT FP Q[39] A[1] R.O. 3 Para. 1/1

Reply OBJ 3: Divine things are named by us after the way of created
things, as above explained (Q[13], AA[1],3). And since created natures
are individualized by matter which is the subject of the specific nature,
it follows that individuals are called "subjects," "supposita," or
"hypostases." So the divine persons are named "supposita" or
"hypostases," but not as if there really existed any real "supposition"
or "subjection."


Aquin.: SMT FP Q[39] A[2] Thes. Para. 1/1

Whether it must be said that the three persons are of one essence?

Aquin.: SMT FP Q[39] A[2] Obj. 1 Para. 1/1

OBJ 1: It would seem not right to say that the three persons are of one
essence. For Hilary says (De Synod.) that the Father, Son and Holy Ghost
"are indeed three by substance, but one in harmony." But the substance of
God is His essence. Therefore the three persons are not of one essence.

Aquin.: SMT FP Q[39] A[2] Obj. 2 Para. 1/1

OBJ 2: Further, nothing is to be affirmed of God except what can be
confirmed by the authority of Holy Writ, as appears from Dionysius (Div.
Nom. i). Now Holy Writ never says that the Father, Son and Holy Ghost are of one essence. Therefore this should not be asserted.

Aquin.: SMT FP Q[39] A[2] Obj. 3 Para. 1/1

OBJ 3: Further, the divine nature is the same as the divine essence. It
suffices therefore to say that the three persons are of one nature.

Aquin.: SMT FP Q[39] A[2] Obj. 4 Para. 1/1

OBJ 4: Further, it is not usual to say that the person is of the
essence; but rather that the essence is of the person. Therefore it does
not seem fitting to say that the three persons are of one essence.

Aquin.: SMT FP Q[39] A[2] Obj. 5 Para. 1/1

OBJ 5: Further, Augustine says (De Trin. vii, 6) that we do not say that
the three persons are "from one essence [ex una essentia]," lest we
should seem to indicate a distinction between the essence and the persons
in God. But prepositions which imply transition, denote the oblique
case. Therefore it is equally wrong to say that the three persons are "of
one essence [unius essentiae]."

Aquin.: SMT FP Q[39] A[2] Obj. 6 Para. 1/1

OBJ 6: Further, nothing should be said of God which can be occasion of
error. Now, to say that the three persons are of one essence or
substance, furnishes occasion of error. For, as Hilary says (De Synod.):
"One substance predicated of the Father and the Son signifies either one
subsistent, with two denominations; or one substance divided into two
imperfect substances; or a third prior substance taken and assumed by the
other two." Therefore it must not be said that the three persons are of
one substance.

Aquin.: SMT FP Q[39] A[2] OTC Para. 1/1

On the contrary, Augustine says (Contra Maxim. iii) that the word
{homoousion}, which the Council of Nicaea adopted against the Arians,
means that the three persons are of one essence.

Aquin.: SMT FP Q[39] A[2] Body Para. 1/1

I answer that, As above explained (Q[13], AA[1],2), divine things are
named by our intellect, not as they really are in themselves, for in that
way it knows them not; but in a way that belongs to things created. And
as in the objects of the senses, whence the intellect derives its
knowledge, the nature of the species is made individual by the matter,
and thus the nature is as the form, and the individual is the
"suppositum" of the form; so also in God the essence is taken as the form
of the three persons, according to our mode of signification. Now in
creatures we say that every form belongs to that whereof it is the form;
as the health and beauty of a man belongs to the man. But we do not say
of that which has a form, that it belongs to the form, unless some
adjective qualifies the form; as when we say: "That woman is of a
handsome figure," or: "This man is of perfect virtue." In like manner, as
in God the persons are multiplied, and the essence is not multiplied, we
speak of one essence of the three persons, and three persons of the one
essence, provided that these genitives be understood as designating the
form.

Aquin.: SMT FP Q[39] A[2] R.O. 1 Para. 1/1

Reply OBJ 1: Substance is here taken for the "hypostasis," and not for
the essence.

Aquin.: SMT FP Q[39] A[2] R.O. 2 Para. 1/1

Reply OBJ 2: Although we may not find it declared in Holy Writ in so
many words that the three persons are of one essence, nevertheless we
find it so stated as regards the meaning; for instance, "I and the Father
are one (Jn. 10:30)," and "I am in the Father, and the Father in Me (Jn.
10:38)"; and there are many other texts of the same import.

Aquin.: SMT FP Q[39] A[2] R.O. 3 Para. 1/1

Reply OBJ 3: Because "nature" designates the principle of action while
"essence" comes from being [essendo], things may be said to be of one
nature which agree in some action, as all things which give heat; but
only those things can be said to be of "one essence" which have one
being. So the divine unity is better described by saying that the three
persons are "of one essence," than by saying they are "of one nature."

Aquin.: SMT FP Q[39] A[2] R.O. 4 Para. 1/1

Reply OBJ 4: Form, in the absolute sense, is wont to be designated as
belonging to that of which it is the form, as we say "the virtue of
Peter." On the other hand, the thing having form is not wont to be
designated as belonging to the form except when we wish to qualify or
designate the form. In which case two genitives are required, one
signifying the form, and the other signifying the determination of the
form, as, for instance, when we say, "Peter is of great virtue [magnae
virtutis]," or else one genitive must have the force of two, as, for
instance, "he is a man of blood" - that is, he is a man who sheds much
blood [multi sanguinis]. So, because the divine essence signifies a form
as regards the person, it may properly be said that the essence is of the
person; but we cannot say the converse, unless we add some term to
designate the essence; as, for instance, the Father is a person of the
"divine essence"; or, the three persons are "of one essence."

Aquin.: SMT FP Q[39] A[2] R.O. 5 Para. 1/1

Reply OBJ 5: The preposition "from" or "out of" does not designate the
habitude of a formal cause, but rather the habitude of an efficient or
material cause; which causes are in all cases distinguished from those
things of which they are the causes. For nothing can be its own matter,
nor its own active principle. Yet a thing may be its own form, as appears
in all immaterial things. So, when we say, "three persons of one
essence," taking essence as having the habitude of form, we do not mean
that essence is different from person, which we should mean if we said,
"three persons from the same essence."

Aquin.: SMT FP Q[39] A[2] R.O. 6 Para. 1/1

Reply OBJ 6: As Hilary says (De Synod.): "It would be prejudicial to
holy things, if we had to do away with them, just because some do not think them holy. So if some misunderstand {homoousion}, what is that to
me, if I understand it rightly? . . . The oneness of nature does not
result from division, or from union or from community of possession, but
from one nature being proper to both Father and Son."


Aquin.: SMT FP Q[39] A[3] Thes. Para. 1/1

Whether essential names should be predicated in the singular of the three
persons?

Aquin.: SMT FP Q[39] A[3] Obj. 1 Para. 1/1

OBJ 1: It would seem that essential names, as the name "God," should not
be predicated in the singular of the three persons, but in the plural.
For as "man" signifies "one that has humanity," so God signifies "one
that has Godhead." But the three persons are three who have Godhead.
Therefore the three persons are "three Gods."

Aquin.: SMT FP Q[39] A[3] Obj. 2 Para. 1/1

OBJ 2: Further, Gn. 1:1, where it is said, "In the beginning God created
heaven and earth," the Hebrew original has "Elohim," which may be
rendered "Gods" or "Judges": and this word is used on account of the
plurality of persons. Therefore the three persons are "several Gods," and
not "one" God.

Aquin.: SMT FP Q[39] A[3] Obj. 3 Para. 1/1

OBJ 3: Further, this word "thing" when it is said absolutely, seems to
belong to substance. But it is predicated of the three persons in the
plural. For Augustine says (De Doctr. Christ. i, 5): "The things that are
the objects of our future glory are the Father, Son and Holy Ghost."
Therefore other essential names can be predicated in the plural of the
three persons.

Aquin.: SMT FP Q[39] A[3] Obj. 4 Para. 1/1

OBJ 4: Further, as this word "God" signifies "a being who has Deity," so
also this word "person" signifies a being subsisting in an intellectual
nature. But we say there are three persons. So for the same reason we can
say there are "three Gods."

Aquin.: SMT FP Q[39] A[3] OTC Para. 1/1

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

Aquin.: SMT FP Q[39] A[3] Body Para. 1/1

I answer that, Some essential names signify the essence after the manner
of substantives; while others signify it after the manner of adjectives.
Those which signify it as substantives are predicated of the three
persons in the singular only, and not in the plural. Those which signify
the essence as adjectives are predicated of the three persons in the
plural. The reason of this is that substantives signify something by way
of substance, while adjectives signify something by way of accident,
which adheres to a subject. Now just as substance has existence of
itself, so also it has of itself unity or multitude; wherefore the
singularity or plurality of a substantive name depends upon the form
signified by the name. But as accidents have their existence in a
subject, so they have unity or plurality from their subject; and
therefore the singularity and plurality of adjectives depends upon their
"supposita." In creatures, one form does not exist in several "supposita"
except by unity of order, as the form of an ordered multitude. So if the
names signifying such a form are substantives, they are predicated of
many in the singular, but otherwise if they adjectives. For we say that
many men are a college, or an army, or a people; but we say that many men
are collegians. Now in God the divine essence is signified by way of a
form, as above explained (A[2]), which, indeed, is simple and supremely
one, as shown above (Q[3], A[7]; Q[11], A[4]). So, names which signify
the divine essence in a substantive manner are predicated of the three
persons in the singular, and not in the plural. This, then, is the reason
why we say that Socrates, Plato and Cicero are "three men"; whereas we do
not say the Father, Son and Holy Ghost are "three Gods," but "one God";
forasmuch as in the three "supposita" of human nature there are three
humanities, whereas in the three divine Persons there is but one divine
essence. On the other hand, the names which signify essence in an
adjectival manner are predicated of the three persons plurally, by reason
of the plurality of "supposita." For we say there are three "existent" or
three "wise" beings, or three "eternal," "uncreated," and "immense"
beings, if these terms are understood in an adjectival sense. But if
taken in a substantive sense, we say "one uncreated, immense, eternal
being," as Athanasius declares.

Aquin.: SMT FP Q[39] A[3] R.O. 1 Para. 1/1

Reply OBJ 1: Though the name "God" signifies a being having Godhead,
nevertheless the mode of signification is different. For the name "God"
is used substantively; whereas "having Godhead" is used adjectively.
Consequently, although there are "three having Godhead," it does not
follow that there are three Gods.

Aquin.: SMT FP Q[39] A[3] R.O. 2 Para. 1/1

Reply OBJ 2: Various languages have diverse modes of expression. So as
by reason of the plurality of "supposita" the Greeks said "three
hypostases," so also in Hebrew "Elohim" is in the plural. We, however, do
not apply the plural either to "God" or to "substance," lest plurality be
referred to the substance.

Aquin.: SMT FP Q[39] A[3] R.O. 3 Para. 1/1

Reply OBJ 3: This word "thing" is one of the transcendentals. Whence, so
far as it is referred to relation, it is predicated of God in the plural;
whereas, so far as it is referred to the substance, it is predicated in
the singular. So Augustine says, in the passage quoted, that "the same
Trinity is a thing supreme."

Aquin.: SMT FP Q[39] A[3] R.O. 4 Para. 1/1

Reply OBJ 4: The form signified by the word "person" is not essence or
nature, but personality. So, as there are three personalities - that is,
three personal properties in the Father, Son and Holy Ghost - it is
predicated of the three, not in the singular, but in the plural.


Aquin.: SMT FP Q[39] A[4] Thes. Para. 1/1

Whether the concrete essential names can stand for the person?

Aquin.: SMT FP Q[39] A[4] Obj. 1 Para. 1/1

OBJ 1: It would seem that the concrete, essential names cannot stand for
the person, so that we can truly say "God begot God." For, as the
logicians say, "a singular term signifies what it stands for." But this
name "God" seems to be a singular term, for it cannot be predicated in
the plural, as above explained (A[3]). Therefore, since it signifies the
essence, it stands for essence, and not for person.

Aquin.: SMT FP Q[39] A[4] Obj. 2 Para. 1/1

OBJ 2: Further, a term in the subject is not modified by a term in the
predicate, as to its signification; but only as to the sense signified in
the predicate. But when I say, "God creates," this name "God" stands for
the essence. So when we say "God begot," this term "God" cannot by reason
of the notional predicate, stand for person.

Aquin.: SMT FP Q[39] A[4] Obj. 3 Para. 1/1

OBJ 3: Further, if this be true, "God begot," because the Father
generates; for the same reason this is true, "God does not beget,"
because the Son does not beget. Therefore there is God who begets, and
there is God who does not beget; and thus it follows that there are two
Gods.

Aquin.: SMT FP Q[39] A[4] Obj. 4 Para. 1/1

OBJ 4: Further, if "God begot God," He begot either God, that is
Himself, or another God. But He did not beget God, that is Himself; for,
as Augustine says (De Trin. i, 1), "nothing begets itself." Neither did
He beget another God; as there is only one God. Therefore it is false to
say, "God begot God."

Aquin.: SMT FP Q[39] A[4] Obj. 5 Para. 1/1

OBJ 5: Further, if "God begot God," He begot either God who is the
Father, or God who is not the Father. If God who is the Father, then God
the Father was begotten. If God who is not the Father, then there is a
God who is not God the Father: which is false. Therefore it cannot be
said that "God begot God."

Aquin.: SMT FP Q[39] A[4] OTC Para. 1/1

On the contrary, In the Creed it is said, "God of God."

Aquin.: SMT FP Q[39] A[4] Body Para. 1/1

I answer that, Some have said that this name "God" and the like,
properly according to their nature, stand for the essence, but by reason
of some notional adjunct are made to stand for the Person. This opinion
apparently arose from considering the divine simplicity, which requires
that in God, He "who possesses" and "what is possessed" be the same. So
He who possesses Godhead, which is signified by the name God, is the same
as Godhead. But when we consider the proper way of expressing ourselves,
the mode of signification must be considered no less than the thing
signified. Hence as this word "God" signifies the divine essence as in
Him Who possesses it, just as the name "man" signifies humanity in a
subject, others more truly have said that this word "God," from its mode
of signification, can, in its proper sense, stand for person, as does the
word "man." So this word "God" sometimes stands for the essence, as when
we say "God creates"; because this predicate is attributed to the subject
by reason of the form signified - that is, Godhead. But sometimes it
stands for the person, either for only one, as when we say, "God begets,"
or for two, as when we say, "God spirates"; or for three, as when it is
said: "To the King of ages, immortal, invisible, the only God," etc. (1
Tim. 1:17).

Aquin.: SMT FP Q[39] A[4] R.O. 1 Para. 1/1

Reply OBJ 1: Although this name "God" agrees with singular terms as
regards the form signified not being multiplied; nevertheless it agrees
also with general terms so far as the form signified is to be found in
several "supposita." So it need not always stand for the essence it
signifies.

Aquin.: SMT FP Q[39] A[4] R.O. 2 Para. 1/1

Reply OBJ 2: This holds good against those who say that the word "God"
does not naturally stand for person.

Aquin.: SMT FP Q[39] A[4] R.O. 3 Para. 1/1

Reply OBJ 3: The word "God" stands for the person in a different way
from that in which this word "man" does; for since the form signified by
this word "man" - that is, humanity - is really divided among its
different subjects, it stands of itself for the person, even if there is
no adjunct determining it to the person - that is, to a distinct subject.
The unity or community of the human nature, however, is not a reality,
but is only in the consideration of the mind. Hence this term "man" does
not stand for the common nature, unless this is required by some adjunct,
as when we say, "man is a species"; whereas the form signified by the
name "God" - that is, the divine essence - is really one and common. So
of itself it stands for the common nature, but by some adjunct it may be
restricted so as to stand for the person. So, when we say, "God
generates," by reason of the notional act this name "God" stands for the
person of the Father. But when we say, "God does not generate," there is
no adjunct to determine this name to the person of the Son, and hence the
phrase means that generation is repugnant to the divine nature. If,
however, something be added belonging to the person of the Son, this
proposition, for instance, "God begotten does not beget," is true.
Consequently, it does not follow that there exists a "God generator," and
a "God not generator"; unless there be an adjunct pertaining to the
persons; as, for instance, if we were to say, "the Father is God the
generator" and the "Son is God the non-generator" and so it does not
follow that there are many Gods; for the Father and the Son are one God,
as was said above (A[3]).

Aquin.: SMT FP Q[39] A[4] R.O. 4 Para. 1/1

Reply OBJ 4: This is false, "the Father begot God, that is Himself,"
because the word "Himself," as a reciprocal term, refers to the same
"suppositum." Nor is this contrary to what Augustine says (Ep. lxvi ad
Maxim.) that "God the Father begot another self [alterum se]," forasmuch
as the word "se" is either in the ablative case, and then it means "He
begot another from Himself," or it indicates a single relation, and thus
points to identity of nature. This is, however, either a figurative or an
emphatic way of speaking, so that it would really mean, "He begot another
most like to Himself." Likewise also it is false to say, "He begot
another God," because although the Son is another than the Father, as
above explained (Q[31], A[2]), nevertheless it cannot be said that He is
"another God"; forasmuch as this adjective "another" would be understood
to apply to the substantive God; and thus the meaning would be that there
is a distinction of Godhead. Yet this proposition "He begot another God"
is tolerated by some, provided that "another" be taken as a substantive,
and the word "God" be construed in apposition with it. This, however, is
an inexact way of speaking, and to be avoided, for fear of giving
occasion to error.

Aquin.: SMT FP Q[39] A[4] R.O. 5 Para. 1/1

Reply OBJ 5: To say, "God begot God Who is God the Father," is wrong,
because since the word "Father" is construed in apposition to "God," the
word "God" is restricted to the person of the Father; so that it would
mean, "He begot God, Who is Himself the Father"; and then the Father
would be spoken of as begotten, which is false. Wherefore the negative of
the proposition is true, "He begot God Who is not God the Father." If
however, we understand these words not to be in apposition, and require
something to be added, then, on the contrary, the affirmative proposition
is true, and the negative is false; so that the meaning would be, "He
begot God Who is God Who is the Father." Such a rendering however appears
to be forced, so that it is better to say simply that the affirmative
proposition is false, and the negative is true. Yet Prepositivus said
that both the negative and affirmative are false, because this relative
"Who" in the affirmative proposition can be referred to the "suppositum";
whereas in the negative it denotes both the thing signified and the
"suppositum." Whence, in the affirmative the sense is that "to be God the
Father" is befitting to the person of the Son; and in the negative sense
is that "to be God the Father," is to be removed from the Son's divinity
as well as from His personality. This, however, appears to be irrational;
since, according to the Philosopher (Peri Herm. ii), what is open to
affirmation, is open also to negation.


Aquin.: SMT FP Q[39] A[5] Thes. Para. 1/1

Whether abstract essential names can stand for the person?

Aquin.: SMT FP Q[39] A[5] Obj. 1 Para. 1/1

OBJ 1: It would seem that abstract essential names can stand for the
person, so that this proposition is true, "Essence begets essence." For
Augustine says (De Trin. vii, i, 2): "The Father and the Son are one
Wisdom, because they are one essence; and taken singly Wisdom is from Wisdom, as essence from essence."

Aquin.: SMT FP Q[39] A[5] Obj. 2 Para. 1/1

OBJ 2: Further, generation or corruption in ourselves implies generation
or corruption of what is within us. But the Son is generated. Therefore
since the divine essence is in the Son, it seems that the divine essence
is generated.

Aquin.: SMT FP Q[39] A[5] Obj. 3 Para. 1/1

OBJ 3: Further, God and the divine essence are the same, as is clear
from what is above explained (Q[3], A[3]). But, as was shown, it is true
to say that "God begets God." Therefore this is also true: "Essence
begets essence."

Aquin.: SMT FP Q[39] A[5] Obj. 4 Para. 1/1

OBJ 4: Further, a predicate can stand for that of which it is
predicated. But the Father is the divine essence; therefore essence can
stand for the person of the Father. Thus the essence begets.

Aquin.: SMT FP Q[39] A[5] Obj. 5 Para. 1/1

OBJ 5: Further, the essence is "a thing begetting," because the essence
is the Father who is begetting. Therefore if the essence is not
begetting, the essence will be "a thing begetting," and "not begetting":
which cannot be.

Aquin.: SMT FP Q[39] A[5] Obj. 6 Para. 1/1

OBJ 6: Further, Augustine says (De Trin. iv, 20): "The Father is the
principle of the whole Godhead." But He is principle only by begetting or
spirating. Therefore the Father begets or spirates the Godhead.

Aquin.: SMT FP Q[39] A[5] OTC Para. 1/1

On the contrary, Augustine says (De Trin. i, 1): "Nothing begets
itself." But if the essence begets the essence, it begets itself only,
since nothing exists in God as distinguished from the divine essence.
Therefore the essence does not beget essence.

Aquin.: SMT FP Q[39] A[5] Body Para. 1/1

I answer that, Concerning this, the abbot Joachim erred in asserting that as we can say "God begot God," so we can say "Essence begot
essence": considering that, by reason of the divine simplicity God is
nothing else but the divine essence. In this he was wrong, because if we
wish to express ourselves correctly, we must take into account not only
the thing which is signified, but also the mode of its signification as
above stated (A[4]). Now although "God" is really the same as "Godhead,"
nevertheless the mode of signification is not in each case the same. For since this word "God" signifies the divine essence in Him that possesses
it, from its mode of signification it can of its own nature stand for
person. Thus the things which properly belong to the persons, can be
predicated of this word, "God," as, for instance, we can say "God is
begotten" or is "Begetter," as above explained (A[4]). The word
"essence," however, in its mode of signification, cannot stand for
Person, because it signifies the essence as an abstract form.
Consequently, what properly belongs to the persons whereby they are
distinguished from each other, cannot be attributed to the essence. For
that would imply distinction in the divine essence, in the same way as
there exists distinction in the "supposita."

Aquin.: SMT FP Q[39] A[5] R.O. 1 Para. 1/1

Reply OBJ 1: To express unity of essence and of person, the holy Doctors
have sometimes expressed themselves with greater emphasis than the strict
propriety of terms allows. Whence instead of enlarging upon such
expressions we should rather explain them: thus, for instance, abstract
names should be explained by concrete names, or even by personal names;
as when we find "essence from essence"; or "wisdom from wisdom"; we
should take the sense to be, "the Son" who is essence and wisdom, is from
the Father who is essence and wisdom. Nevertheless, as regards these
abstract names a certain order should be observed, forasmuch as what
belongs to action is more nearly allied to the persons because actions
belong to "supposita." So "nature from nature," and "wisdom from wisdom"
are less inexact than "essence from essence."

Aquin.: SMT FP Q[39] A[5] R.O. 2 Para. 1/1

Reply OBJ 2: In creatures the one generated has not the same nature
numerically as the generator, but another nature, numerically distinct,
which commences to exist in it anew by generation, and ceases to exist by
corruption, and so it is generated and corrupted accidentally; whereas
God begotten has the same nature numerically as the begetter. So the
divine nature in the Son is not begotten either directly or accidentally.

Aquin.: SMT FP Q[39] A[5] R.O. 3 Para. 1/1

Reply OBJ 3: Although God and the divine essence are really the same,
nevertheless, on account of their different mode of signification, we
must speak in a different way about each of them.

Aquin.: SMT FP Q[39] A[5] R.O. 4 Para. 1/1

Reply OBJ 4: The divine essence is predicated of the Father by mode of
identity by reason of the divine simplicity; yet it does not follow that
it can stand for the Father, its mode of signification being different.
This objection would hold good as regards things which are predicated of
another as the universal of a particular.

Aquin.: SMT FP Q[39] A[5] R.O. 5 Para. 1/1

Reply OBJ 5: The difference between substantive and adjectival names
consist in this, that the former carry their subject with them, whereas
the latter do not, but add the thing signified to the substantive. Whence logicians are wont to say that the substantive is considered in the light
of "suppositum," whereas the adjective indicates something added to the
"suppositum." Therefore substantive personal terms can be predicated of
the essence, because they are really the same; nor does it follow that a
personal property makes a distinct essence; but it belongs to the
"suppositum" implied in the substantive. But notional and personal
adjectives cannot be predicated of the essence unless we add some
substantive. We cannot say that the "essence is begetting"; yet we can
say that the "essence is a thing begetting," or that it is "God
begetting," if "thing" and God stand for person, but not if they stand
for essence. Consequently there exists no contradiction in saying that
"essence is a thing begetting," and "a thing not begetting"; because in
the first case "thing" stands for person, and in the second it stands
for the essence.

Aquin.: SMT FP Q[39] A[5] R.O. 6 Para. 1/1

Reply OBJ 6: So far as Godhead is one in several "supposita," it agrees
in a certain degree with the form of a collective term. So when we say,
"the Father is the principle of the whole Godhead," the term Godhead can
be taken for all the persons together, inasmuch as it is the principle in
all the divine persons. Nor does it follow that He is His own principle;
as one of the people may be called the ruler of the people without being
ruler of himself. We may also say that He is the principle of the whole
Godhead; not as generating or spirating it, but as communicating it by
generation and spiration.


Aquin.: SMT FP Q[39] A[6] Thes. Para. 1/1

Whether the persons can be predicated of the essential terms?

Aquin.: SMT FP Q[39] A[6] Obj. 1 Para. 1/1

OBJ 1: It would seem that the persons cannot be predicated of the
concrete essential names; so that we can say for instance, "God is three
persons"; or "God is the Trinity." For it is false to say, "man is every
man," because it cannot be verified as regards any particular subject.
For neither Socrates, nor Plato, nor anyone else is every man. In the
same way this proposition, "God is the Trinity," cannot be verified of
any one of the "supposita" of the divine nature. For the Father is not
the Trinity; nor is the Son; nor is the Holy Ghost. So to say, "God is
the Trinity," is false.

Aquin.: SMT FP Q[39] A[6] Obj. 2 Para. 1/1

OBJ 2: Further, the lower is not predicated of the higher except by
accidental predication; as when I say, "animal is man"; for it is
accidental to animal to be man. But this name "God" as regards the three
persons is as a general term to inferior terms, as Damascene says (De
Fide Orth. iii, 4). Therefore it seems that the names of the persons
cannot be predicated of this name "God," except in an accidental sense.

Aquin.: SMT FP Q[39] A[6] OTC Para. 1/1

On the contrary, Augustine says, in his sermon on Faith [*Serm. ii, in
coena Domini], "We believe that one God is one divinely named Trinity."

Aquin.: SMT FP Q[39] A[6] Body Para. 1/1

I answer that, As above explained (A[5]), although adjectival terms,
whether personal or notional, cannot be predicated of the essence,
nevertheless substantive terms can be so predicated, owing to the real
identity of essence and person. The divine essence is not only really the
same as one person, but it is really the same as the three persons.
Whence, one person, and two, and three, can be predicated of the essence
as if we were to say, "The essence is the Father, and the Son, and the
Holy Ghost." And because this word "God" can of itself stand for the
essence, as above explained (A[4], ad 3), hence, as it is true to say,
"The essence is the three persons"; so likewise it is true to say, "God
is the three persons."

Aquin.: SMT FP Q[39] A[6] R.O. 1 Para. 1/1

Reply OBJ 1: As above explained this term "man" can of itself stand for
person, whereas an adjunct is required for it to stand for the universal
human nature. So it is false to say, "