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St. Thomas Aquinas
Summa Theologica

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  • FIRST PART (FP: QQ 1-119)
      • Aquin.: SMT FP Q[32] Out. Para. 1/1 - THE KNOWLEDGE OF THE DIVINE PERSONS (FOUR ARTICLES)
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Aquin.: SMT FP Q[32] Out. Para. 1/1 - THE KNOWLEDGE OF THE DIVINE PERSONS (FOUR ARTICLES)

We proceed to inquire concerning the knowledge of the divine persons;
and this involves four points of inquiry:

(1) Whether the divine persons can be known by natural reason?

(2) Whether notions are to be attributed to the divine persons?

(3) The number of the notions?

(4) Whether we may lawfully have various contrary opinions of these
notions?


Aquin.: SMT FP Q[32] A[1] Thes. Para. 1/1

Whether the trinity of the divine persons can be known by natural reason?

Aquin.: SMT FP Q[32] A[1] Obj. 1 Para. 1/1

OBJ 1: It would seem that the trinity of the divine persons can be known
by natural reason. For philosophers came to the knowledge of God not
otherwise than by natural reason. Now we find that they said many things
about the trinity of persons, for Aristotle says (De Coelo et Mundo i,
2): "Through this number" - namely, three - "we bring ourselves to
acknowledge the greatness of one God, surpassing all things created." And
Augustine says (Confess. vii, 9): "I have read in their works, not in so
many words, but enforced by many and various reasons, that in the
beginning was the Word, and the Word was with God, and the Word was God,"
and so on; in which passage the distinction of persons is laid down. We
read, moreover, in a gloss on Rm. 1 and Ex. 8 that the magicians of
Pharaoh failed in the third sign - that is, as regards knowledge of a
third person - i.e. of the Holy Ghost - and thus it is clear that they
knew at least two persons. Likewise Trismegistus says: "The monad begot a
monad, and reflected upon itself its own heat." By which words the
generation of the Son and procession of the Holy Ghost seem to be
indicated. Therefore knowledge of the divine persons can be obtained by
natural reason.

Aquin.: SMT FP Q[32] A[1] Obj. 2 Para. 1/1

OBJ 2: Further, Richard St. Victor says (De Trin. i, 4): "I believe
without doubt that probable and even necessary arguments can be found for
any explanation of the truth." So even to prove the Trinity some have
brought forward a reason from the infinite goodness of God, who
communicates Himself infinitely in the procession of the divine persons;
while some are moved by the consideration that "no good thing can be
joyfully possessed without partnership." Augustine proceeds (De Trin. x,
4; x, 11,12) to prove the trinity of persons by the procession of the
word and of love in our own mind; and we have followed him in this (Q[27]
, AA[1],3). Therefore the trinity of persons can be known by natural
reason.

Aquin.: SMT FP Q[32] A[1] Obj. 3 Para. 1/1

OBJ 3: Further, it seems to be superfluous to teach what cannot be known
by natural reason. But it ought not to be said that the divine tradition
of the Trinity is superfluous. Therefore the trinity of persons can be
known by natural reason.

Aquin.: SMT FP Q[32] A[1] OTC Para. 1/1

On the contrary, Hilary says (De Trin. i), "Let no man think to reach
the sacred mystery of generation by his own mind." And Ambrose says (De
Fide ii, 5), "It is impossible to know the secret of generation. The mind
fails, the voice is silent." But the trinity of the divine persons is
distinguished by origin of generation and procession (Q[30], A[2]).
Since, therefore, man cannot know, and with his understanding grasp that
for which no necessary reason can be given, it follows that the trinity
of persons cannot be known by reason.

Aquin.: SMT FP Q[32] A[1] Body Para. 1/2

I answer that, It is impossible to attain to the knowledge of the
Trinity by natural reason. For, as above explained (Q[12], AA[4],12), man
cannot obtain the knowledge of God by natural reason except from
creatures. Now creatures lead us to the knowledge of God, as effects do
to their cause. Accordingly, by natural reason we can know of God that
only which of necessity belongs to Him as the principle of things, and we
have cited this fundamental principle in treating of God as above (Q[12],
A[12]). Now, the creative power of God is common to the whole Trinity;
and hence it belongs to the unity of the essence, and not to the
distinction of the persons. Therefore, by natural reason we can know what
belongs to the unity of the essence, but not what belongs to the
distinction of the persons. Whoever, then, tries to prove the trinity of
persons by natural reason, derogates from faith in two ways. Firstly, as
regards the dignity of faith itself, which consists in its being
concerned with invisible things, that exceed human reason; wherefore the
Apostle says that "faith is of things that appear not" (Heb. 11:1), and
the same Apostle says also, "We speak wisdom among the perfect, but not
the wisdom of this world, nor of the princes of this world; but we speak
the wisdom of God in a mystery which is hidden" (1 Cor. 2:6,7). Secondly,
as regards the utility of drawing others to the faith. For when anyone in
the endeavor to prove the faith brings forward reasons which are not
cogent, he falls under the ridicule of the unbelievers: since they
suppose that we stand upon such reasons, and that we believe on such
grounds.

Aquin.: SMT FP Q[32] A[1] Body Para. 2/2

Therefore, we must not attempt to prove what is of faith, except by
authority alone, to those who receive the authority; while as regards
others it suffices to prove that what faith teaches is not impossible. Hence it is said by Dionysius (Div. Nom. ii): "Whoever wholly resists the
word, is far off from our philosophy; whereas if he regards the truth of
the word" - i.e. "the sacred word, we too follow this rule."

Aquin.: SMT FP Q[32] A[1] R.O. 1 Para. 1/1

Reply OBJ 1: The philosophers did not know the mystery of the trinity of
the divine persons by its proper attributes, such as paternity,
filiation, and procession, according to the Apostle's words, "We speak
the wisdom of God which none of the princes of the world" - i.e. the
philosophers - "knew" (1 Cor. 2:6). Nevertheless, they knew some of the
essential attributes appropriated to the persons, as power to the Father,
wisdom to the Son, goodness to the Holy Ghost; as will later on appear.
So, when Aristotle said, "By this number," etc., we must not take it as
if he affirmed a threefold number in God, but that he wished to say that
the ancients used the threefold number in their sacrifices and prayers on
account of some perfection residing in the number three. In the Platonic
books also we find, "In the beginning was the word," not as meaning the
Person begotten in God, but as meaning the ideal type whereby God made
all things, and which is appropriated to the Son. And although they knew
these were appropriated to the three persons, yet they are said to have
failed in the third sign - that is, in the knowledge of the third person,
because they deviated from the goodness appropriated to the Holy Ghost,
in that knowing God "they did not glorify Him as God" (Rm. 1); or,
because the Platonists asserted the existence of one Primal Being whom
they also declared to be the father of the universe, they consequently
maintained the existence of another substance beneath him, which they
called "mind" or the "paternal intellect," containing the idea of all
things, as Macrobius relates (Som. Scip. iv). They did not, however,
assert the existence of a third separate substance which might correspond
to the Holy Ghost. So also we do not assert that the Father and the Son
differ in substance, which was the error of Origen and Arius, who in this
followed the Platonists. When Trismegistus says, "Monad begot monad,"
etc., this does not refer to the generation of the Son, or to the
procession of the Holy Ghost, but to the production of the world. For one
God produced one world by reason of His love for Himself.

Aquin.: SMT FP Q[32] A[1] R.O. 2 Para. 1/1

Reply OBJ 2: Reason may be employed in two ways to establish a point:
firstly, for the purpose of furnishing sufficient proof of some
principle, as in natural science, where sufficient proof can be brought
to show that the movement of the heavens is always of uniform velocity.
Reason is employed in another way, not as furnishing a sufficient proof
of a principle, but as confirming an already established principle, by
showing the congruity of its results, as in astrology the theory of
eccentrics and epicycles is considered as established, because thereby
the sensible appearances of the heavenly movements can be explained; not,
however, as if this proof were sufficient, forasmuch as some other theory
might explain them. In the first way, we can prove that God is one; and
the like. In the second way, reasons avail to prove the Trinity; as, when
assumed to be true, such reasons confirm it. We must not, however, think
that the trinity of persons is adequately proved by such reasons. This
becomes evident when we consider each point; for the infinite goodness of
God is manifested also in creation, because to produce from nothing is an
act of infinite power. For if God communicates Himself by His infinite
goodness, it is not necessary that an infinite effect should proceed from
God: but that according to its own mode and capacity it should receive
the divine goodness. Likewise, when it is said that joyous possession of
good requires partnership, this holds in the case of one not having
perfect goodness: hence it needs to share some other's good, in order to
have the goodness of complete happiness. Nor is the image in our mind an
adequate proof in the case of God, forasmuch as the intellect is not in
God and ourselves univocally. Hence, Augustine says (Tract. xxvii. in
Joan.) that by faith we arrive at knowledge, and not conversely.

Aquin.: SMT FP Q[32] A[1] R.O. 3 Para. 1/1

Reply OBJ 3: There are two reason why the knowledge of the divine
persons was necessary for us. It was necessary for the right idea of
creation. The fact of saying that God made all things by His Word
excludes the error of those who say that God produced things by
necessity. When we say that in Him there is a procession of love, we
show that God produced creatures not because He needed them, nor because
of any other extrinsic reason, but on account of the love of His own
goodness. So Moses, when he had said, "In the beginning God created
heaven and earth," subjoined, "God said, Let there be light," to manifest
the divine Word; and then said, "God saw the light that it was good," to
show proof of the divine love. The same is also found in the other works
of creation. In another way, and chiefly, that we may think rightly
concerning the salvation of the human race, accomplished by the Incarnate
Son, and by the gift of the Holy Ghost.


Aquin.: SMT FP Q[32] A[2] Thes. Para. 1/1

Whether there are notions in God?

Aquin.: SMT FP Q[32] A[2] Obj. 1 Para. 1/1

OBJ 1: It would seem that in God there are no notions. For Dionysius says (Div. Nom. i): "We must not dare to say anything of God but what is
taught to us by the Holy Scripture." But Holy Scripture does not say
anything concerning notions. Therefore there are none in God.

Aquin.: SMT FP Q[32] A[2] Obj. 2 Para. 1/1

OBJ 2: Further, all that exists in God concerns the unity of the essence
or the trinity of the persons. But the notions do not concern the unity
of the essence, nor the trinity of the persons; for neither can what
belongs to the essence be predicated of the notions: for instance, we do
not say that paternity is wise or creates; nor can what belongs to the
persons be so predicated; for example, we do not say that paternity
begets, nor that filiation is begotten. Therefore there do not exist
notions in God.

Aquin.: SMT FP Q[32] A[2] Obj. 3 Para. 1/1

OBJ 3: Further, we do not require to presuppose any abstract notions as
principles of knowing things which are devoid of composition: for they
are known of themselves. But the divine persons are supremely simple.
Therefore we are not to suppose any notions in God.

Aquin.: SMT FP Q[32] A[2] OTC Para. 1/1

On the contrary, Damascene says (De Fide Orth. iii, 5): "We recognize
difference of hypostases [i.e. of persons], in the three properties; i.e.
in the paternal, the filial, and the processional." Therefore we must
admit properties and notions in God.

Aquin.: SMT FP Q[32] A[2] Body Para. 1/6

I answer that, Prepositivus, considering the simplicity of the persons,
said that in God there were no properties or notions, and wherever there
were mentioned, he propounded the abstract for the concrete. For as we
are accustomed to say, "I beseech your kindness" - i.e. you who are
kind - so when we speak of paternity in God, we mean God the Father.

Aquin.: SMT FP Q[32] A[2] Body Para. 2/6

But, as shown above (Q[3], A[3], ad 1), the use of concrete and abstract
names in God is not in any way repugnant to the divine simplicity;
forasmuch as we always name a thing as we understand it. Now, our
intellect cannot attain to the absolute simplicity of the divine essence,
considered in itself, and therefore, our human intellect apprehends and
names divine things, according to its own mode, that is in so far as
they are found in sensible objects, whence its knowledge is derived. In
these things we use abstract terms to signify simple forms; and to
signify subsistent things we use concrete terms. Hence also we signify
divine things, as above stated, by abstract names, to express their
simplicity; whereas, to express their subsistence and completeness, we
use concrete names.

Aquin.: SMT FP Q[32] A[2] Body Para. 3/6

But not only must essential names be signified in the abstract and in
the concrete, as when we say Deity and God; or wisdom and wise; but the
same applies to the personal names, so that we may say paternity and
Father.

Aquin.: SMT FP Q[32] A[2] Body Para. 4/6

Two chief motives for this can be cited. The first arises from the
obstinacy of heretics. For since we confess the Father, the Son, and the
Holy Ghost to be one God and three persons, to those who ask: "Whereby
are They one God? and whereby are They three persons?" as we answer that
They are one in essence or deity; so there must also be some abstract
terms whereby we may answer that the persons are distinguished; and these
are the properties or notions signified by an abstract term, as paternity
and filiation. Therefore the divine essence is signified as "What"; and
the person as "Who"; and the property as "Whereby."

Aquin.: SMT FP Q[32] A[2] Body Para. 5/6

The second motive is because one person in God is related to two
persons - namely, the person of the Father to the person of the Son and
the person of the Holy Ghost. This is not, however, by one relation;
otherwise it would follow that the Son also and the Holy Ghost would be
related to the Father by one and the same relation. Thus, since relation
alone multiplies the Trinity, it would follow that the Son and the Holy
Ghost would not be two persons. Nor can it be said with Prepositivus that
as God is related in one way to creatures, while creatures are related to
Him in divers ways, so the Father is related by one relation to the Son
and to the Holy Ghost; whereas these two persons are related to the
Father by two relations. For, since the very specific idea of a relation
is that it refers to another, it must be said that two relations are not
specifically different if but one opposite relation corresponds to them.
For the relation of lord and father must differ according to the
difference of filiation and servitude. Now, all creatures are related to
God as His creatures by one specific relation. But the Son and the Holy
Ghost are not related to the Father by one and the same kind of relation.
Hence there is no parity.

Aquin.: SMT FP Q[32] A[2] Body Para. 6/6

Further, in God there is no need to admit any real relation to the
creature (Q[28], A[1],3); while there is no reason against our admitting
in God, many logical relations. But in the Father there must be a real
relation to the Son and to the Holy Ghost. Hence, corresponding to the
two relations of the Son and of the Holy Ghost, whereby they are related to the Father, we must understand two relations in the Father, whereby He
is related to the Son and to the Holy Ghost. Hence, since there is only
one Person of the Father, it is necessary that the relations should be
separately signified in the abstract; and these are what we mean by
properties and notions.

Aquin.: SMT FP Q[32] A[2] R.O. 1 Para. 1/1

Reply OBJ 1: Although the notions are not mentioned in Holy Scripture,
yet the persons are mentioned, comprising the idea of notions, as the
abstract is contained in the concrete.

Aquin.: SMT FP Q[32] A[2] R.O. 2 Para. 1/1

Reply OBJ 2: In God the notions have their significance not after the
manner of realities, but by way of certain ideas whereby the persons are
known; although in God these notions or relations are real, as stated
above (Q[28], A[1]). Therefore whatever has order to any essential or
personal act, cannot be applied to the notions; forasmuch as this is
against their mode of signification. Hence we cannot say that paternity
begets, or creates, or is wise, or is intelligent. The essentials,
however, which are not ordered to any act, but simply remove created
conditions from God, can be predicated of the notions; for we can say
that paternity is eternal, or immense, or such like. So also on account
of the real identity, substantive terms, whether personal or essential,
can be predicated of the notions; for we can say that paternity is God,
and that paternity is the Father.

Aquin.: SMT FP Q[32] A[2] R.O. 3 Para. 1/1

Reply OBJ 3: Although the persons are simple, still without prejudice to
their simplicity, the proper ideas of the persons can be abstractedly
signified, as above explained.


Aquin.: SMT FP Q[32] A[3] Thes. Para. 1/1

Whether there are five notions?

Aquin.: SMT FP Q[32] A[3] Obj. 1 Para. 1/1

OBJ 1: It would seem that there are not five notions. For the notions
proper to the persons are the relations whereby they are distinguished
from each other. But the relations in God are only four (Q[28], A[4]).
Therefore the notions are only four in number.

Aquin.: SMT FP Q[32] A[3] Obj. 2 Para. 1/1

OBJ 2: Further, as there is only one essence in God, He is called one
God, and because in Him there are three persons, He is called the Trine
God. Therefore, if in God there are five notions, He may be called
quinary; which cannot be allowed.

Aquin.: SMT FP Q[32] A[3] Obj. 3 Para. 1/1

OBJ 3: Further, if there are five notions for the three persons in God,
there must be in some one person two or more notions, as in the person of
the Father there is innascibility and paternity, and common spiration.
Either these three notions really differ, or not. If they really differ,
it follows that the person of the Father is composed of several things.
But if they differ only logically, it follows that one of them can be
predicated of another, so that we can say that as the divine goodness is
the same as the divine wisdom by reason of the common reality, so common
spiration is paternity; which is not to be admitted. Therefore there are
not five notions.

Aquin.: SMT FP Q[32] A[3] Obj. 4 Para. 1/1

OBJ 4: On the contrary, It seems that there are more; because as the
Father is from no one, and therefrom is derived the notion of
innascibility; so from the Holy Ghost no other person proceeds. And in
this respect there ought to be a sixth notion.

Aquin.: SMT FP Q[32] A[3] Obj. 5 Para. 1/1

OBJ 5: Further, as the Father and the Son are the common origin of the
Holy Ghost, so it is common to the Son and the Holy Ghost to proceed from
the Father. Therefore, as one notion is common to the Father and the Son,
so there ought to be one notion common to the Son and to the Holy Ghost.

Aquin.: SMT FP Q[32] A[3] Body Para. 1/2

I answer that, A notion is the proper idea whereby we know a divine
Person. Now the divine persons are multiplied by reason of their origin:
and origin includes the idea of someone from whom another comes, and of
someone that comes from another, and by these two modes a person can be
known. Therefore the Person of the Father cannot be known by the fact
that He is from another; but by the fact that He is from no one; and thus
the notion that belongs to Him is called "innascibility." As the source
of another, He can be known in two ways, because as the Son is from Him,
the Father is known by the notion of "paternity"; and as the Holy Ghost
is from Him, He is known by the notion of "common spiration." The Son can
be known as begotten by another, and thus He is known by "filiation"; and
also by another person proceeding from Him, the Holy Ghost, and thus He
is known in the same way as the Father is known, by "common spiration."
The Holy Ghost can be known by the fact that He is from another, or from
others; thus He is known by "procession"; but not by the fact that
another is from Him, as no divine person proceeds from Him.

Aquin.: SMT FP Q[32] A[3] Body Para. 2/2

Therefore, there are Five notions in God: "innascibility," "paternity,"
"filiation," and "procession." Of these only four are relations, for
"innascibility" is not a relation, except by reduction, as will appear
later (Q[33], A[4], ad 3). Four only are properties. For "common
spiration" is not a property; because it belongs to two persons. Three
are personal notions - i.e. constituting persons, "paternity,"
"filiation," and "procession." "Common spiration" and "innascibility" are
called notions of Persons, but not personal notions, as we shall explain
further on (Q[40], A[1], ad 1).

Aquin.: SMT FP Q[32] A[3] R.O. 1 Para. 1/1

Reply OBJ 1: Besides the four relations, another notion must be
admitted, as above explained.

Aquin.: SMT FP Q[32] A[3] R.O. 2 Para. 1/1

Reply OBJ 2: The divine essence is signified as a reality; and likewise
the persons are signified as realities; whereas the notions are signified
as ideas notifying the persons. Therefore, although God is one by unity
of essence, and trine by trinity of persons, nevertheless He is not
quinary by the five notions.

Aquin.: SMT FP Q[32] A[3] R.O. 3 Para. 1/1

Reply OBJ 3: Since the real plurality in God is founded only on relative
opposition, the several properties of one Person, as they are not
relatively opposed to each other, do not really differ. Nor again are
they predicated of each other, because they are different ideas of the
persons; as we do not say that the attribute of power is the attribute of
knowledge, although we do say that knowledge is power.

Aquin.: SMT FP Q[32] A[3] R.O. 4 Para. 1/1

Reply OBJ 4: Since Person implies dignity, as stated above (Q[19], A[3]
) we cannot derive a notion of the Holy Spirit from the fact that no
person is from Him. For this does not belong to His dignity, as it
belongs to the authority of the Father that He is from no one.

Aquin.: SMT FP Q[32] A[3] R.O. 5 Para. 1/1

Reply OBJ 5: The Son and the Holy Ghost do not agree in one special mode
of existence derived from the Father; as the Father and the Son agree in
one special mode of producing the Holy Ghost. But the principle on which
a notion is based must be something special; thus no parity of reasoning
exists.


Aquin.: SMT FP Q[32] A[4] Thes. Para. 1/1

Whether it is lawful to have various contrary opinions of notions?

Aquin.: SMT FP Q[32] A[4] Obj. 1 Para. 1/1

OBJ 1: It would seem that it is not lawful to have various contrary
opinions of the notions. For Augustine says (De Trin. i, 3): "No error is
more dangerous than any as regards the Trinity": to which mystery the
notions assuredly belong. But contrary opinions must be in some way
erroneous. Therefore it is not right to have contrary opinions of the
notions.

Aquin.: SMT FP Q[32] A[4] Obj. 2 Para. 1/1

OBJ 2: Further, the persons are known by the notions. But no contrary
opinion concerning the persons is to be tolerated. Therefore neither can
there be about the notions.

Aquin.: SMT FP Q[32] A[4] OTC Para. 1/1

On the contrary, The notions are not articles of faith. Therefore
different opinions of the notions are permissible.

Aquin.: SMT FP Q[32] A[4] Body Para. 1/3

I answer that, Anything is of faith in two ways; directly, where any
truth comes to us principally as divinely taught, as the trinity and
unity of God, the Incarnation of the Son, and the like; and concerning
these truths a false opinion of itself involves heresy, especially if it
be held obstinately. A thing is of faith, indirectly, if the denial of it
involves as a consequence something against faith; as for instance if
anyone said that Samuel was not the son of Elcana, for it follows that
the divine Scripture would be false. Concerning such things anyone may
have a false opinion without danger of heresy, before the matter has been
considered or settled as involving consequences against faith, and
particularly if no obstinacy be shown; whereas when it is manifest, and
especially if the Church has decided that consequences follow against
faith, then the error cannot be free from heresy. For this reason many
things are now considered as heretical which were formerly not so
considered, as their consequences are now more manifest.

Aquin.: SMT FP Q[32] A[4] Body Para. 2/3

So we must decide that anyone may entertain contrary opinions about the
notions, if he does not mean to uphold anything at variance with faith.
If, however, anyone should entertain a false opinion of the notions,
knowing or thinking that consequences against the faith would follow, he
would lapse into heresy.

Aquin.: SMT FP Q[32] A[4] Body Para. 3/3

By what has been said all the objections may be solved.





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