Q: Whether in God There Are Only Four Real Relations--Paternity, Filiation, Spiration, and Procession?

A: I answer that,
According to the Philosopher (Metaph. v), every relation is based either on quantity, as double and half; or on action and passion, as the doer and the deed, the father and the son, the master and the servant, and the like. Now as there is no quantity in God, for He is great without quantity, as Augustine says (De Trin. i, 1) it follows that a real relation in God can be based only on action. Such relations are not based on the actions of God according to any extrinsic procession, forasmuch as the relations of God to creatures are not real in Him (Q. 13, A. 7). Hence, it follows that real relations in God can be understood only in regard to those actions according to which there are internal, and not external, processions in God. These processions are two only, as above explained (Q. 27, A. 5), one derived from the action of the intellect, the procession of the Word; and the other from the action of the will, the procession of love. In respect of each of these processions two opposite relations arise; one of which is the relation of the person proceeding from the principle; the other is the relation of the principle Himself. The procession of the Word is called generation in the proper sense of the term, whereby it is applied to living things. Now the relation of the principle of generation in perfect living beings is called paternity; and the relation of the one proceeding from the principle is called filiation. But the procession of Love has no proper name of its own (Q. 27, A. 4); and so neither have the ensuing relations a proper name of their own. The relation of the principle of this procession is called spiration; and the relation of the person proceeding is called procession: although these two names belong to the processions or origins themselves, and not to the relations.

Reply Obj. 1: In those things in which there is a difference between the intellect and its object, and the will and its object, there can be a real relation, both of science to its object, and of the willer to the object willed. In God, however, the intellect and its object are one and the same; because by understanding Himself, God understands all other things; and the same applies to His will and the object that He wills. Hence it follows that in God these kinds of relations are not real; as neither is the relation of a thing to itself. Nevertheless, the relation to the word is a real relation; because the word is understood as proceeding by an intelligible action; and not as a thing understood. For when we understand a stone; that which the intellect conceives from the thing understood, is called the word.

Reply Obj. 2: Intelligible relations in ourselves are infinitely multiplied, because a man understands a stone by one act, and by another act understands that he understands the stone, and again by another, understands that he understands this; thus the acts of understanding are infinitely multiplied, and consequently also the relations understood. This does not apply to God, inasmuch as He understands all things by one act alone.

Reply Obj. 3: Ideal relations exist as understood by God. Hence it does not follow from their plurality that there are many relations in God; but that God knows these many relations.

Reply Obj. 4: Equality and similitude in God are not real relations; but are only logical relations (Q. 42, A. 3, ad 4).

Reply Obj. 5: The way from one term to another and conversely is the same; nevertheless the mutual relations are not the same. Hence, we cannot conclude that the relation of the father to the son is the same as that of the son to the father; but we could conclude this of something absolute, if there were such between them.

QUESTION 29

THE DIVINE PERSONS (In Four Articles)

Having premised what have appeared necessary notions concerning the processions and the relations, we must now approach the subject of the persons.

First, we shall consider the persons absolutely, and then comparatively as regards each other. We must consider the persons absolutely first in common; and then singly.

The general consideration of the persons seemingly involves four points:

(1) The signification of this word "person";

(2) the number of the persons;

(3) what is involved in the number of persons, or is opposed thereto; as diversity, and similitude, and the like; and

(4) what belongs to our knowledge of the persons.

Four subjects of inquiry are comprised in the first point:

(1) The definition of "person."

(2) The comparison of person to essence, subsistence, and hypostasis.

(3) Whether the name of person is becoming to God?

(4) What does it signify in Him?