SUMMA THEOLOGICA. Thomas Aquinas
5:30). Therefore the Father has greater power than the Son.
Objection 3: Further, it belongs to the Father's omnipotence to be able to beget a Son equal to Himself. For Augustine says (Contra Maxim. iii, 7), "Were He unable to beget one equal to Himself, where would be the omnipotence of God the Father?" But the Son cannot beget a Son, as proved above ( Question [41], Article [6]). Therefore the Son cannot do all that belongs to the Father's omnipotence; and hence He is not equal to Him power.
On the contrary, It is said (Jn. 5:19): "Whatsoever things the Father doth, these the Son also doth in like manner."
I answer that, The Son is necessarily equal to the Father in power. Power of action is a consequence of perfection in nature. In creatures, for instance, we see that the more perfect the nature, the greater power is there for action. Now it was shown above ( Article [4]) that the very notion of the divine paternity and filiation requires that the Son should be the Father's equal in greatness---that is, in perfection of nature. Hence it follows that the Son is equal to the Father in power; and the same applies to the Holy Ghost in relation to both.
Reply to Objection 1: The words, "the Son cannot of Himself do anything," do not withdraw from the Son any power possessed by the Father, since it is immediately added, "Whatsoever things the Father doth, the Son doth in like manner"; but their meaning is to show that the Son derives His power from the Father, of Whom He receives His nature. Hence, Hilary says (De Trin. ix), "The unity of the divine nature implies that the Son so acts of Himself [per se], that He does not act by Himself [a se]."
Reply to Objection 2: The Father's "showing" and the Son's "hearing" are to be taken in the sense that the Father communicates knowledge to the Son, as He communicates His essence. The command of the Father can be explained in the same sense, as giving Him from eternity knowledge and will to act, by begetting Him. Or, better still, this may be referred to Christ in His human nature.
Reply to Objection 3: As the same essence is paternity in the Father, and filiation in the Son: so by the same power the Father begets, and the Son is begotten. Hence it is clear that the Son can do whatever the Father can do; yet it does not follow that the Son can beget; for to argue thus would imply transition from substance to relation, for generation signifies a divine relation. So the Son has the same omnipotence as the Father, but with another relation; the Father possessing power as "giving" signified when we say that He is able to beget; while the Son possesses the power of "receiving," signified by saying that He can be begotten.
THE MISSION OF THE DIVINE PERSONS (EIGHT ARTICLES)
We next consider the mission of the divine persons, concerning which there are eight points of inquiry:
(1) Whether it is suitable for a divine person to be sent?
(2) Whether mission is eternal, or only temporal?
(3) In what sense a divine person is invisibly sent?
(4) Whether it is fitting that each person be sent?
(5) Whether both the Son and the Holy Ghost are invisibly sent?
(6) To whom the invisible mission is directed?
(7) Of the visible mission
(8) Whether any person sends Himself visibly or invisibly?
Whether a divine person can be properly sent?
Objection 1: It would seem that a divine person cannot be properly sent. For one who is sent is less than the sender. But one divine person is not less than another. Therefore one person is not sent by another.
Objection 2: Further, what is sent is separated from the sender; hence Jerome says, commenting on Ezech. 16:53: "What is joined and tied in one body cannot be sent." But in the divine persons there is nothing that is separable, as Hilary says (De Trin. vii). Therefore one person is not sent by another.
Objection 3: Further, whoever is sent, departs from one place and comes anew into another. But this does not apply to a divine person, Who is everywhere. Therefore it is not suitable for a divine person to be sent.
On the contrary, It is said (Jn. 8:16): "I am not alone, but I and the Father that sent Me."
I answer that, the notion of mission includes two things: the habitude of the one sent to the sender; and that of the one sent to the end whereto he is sent. Anyone being sent implies a certain kind of procession of the one sent from the sender: either according to command, as the master sends the servant; or according to counsel, as an adviser may be said to send the king to battle; or according to origin, as a tree sends forth its flowers. The habitude to the term to which he is sent is also shown, so that in some way he begins to be present there: either because in no way was he present before in the place whereto he is sent, or because he begins to be there in some way in which he was not there hitherto. Thus the mission of a divine person is a fitting thing, as meaning in one way the procession of origin from the sender, and as meaning a new way of existing in another; thus the Son is said to be sent by the Father into the world, inasmuch as He began to exist visibly in the world by taking our nature; whereas "He was" previously "in the world" (Jn. 1:1).
Reply to Objection 1: Mission implies inferiority in the one sent, when it means procession from the sender as principle, by command or counsel; forasmuch as the one commanding is the greater, and the counsellor is the wiser. In God, however, it means only procession of origin, which is according to equality, as explained above ( Question [42], Articles [4],6).
Reply to Objection 2: What is so sent as to begin to exist where previously it did not exist, is locally moved by being sent; hence it is necessarily separated locally from the sender. This, however, has no place in the mission of a divine person; for the divine person sent neither begins to exist where he did not previously exist, nor ceases to exist where He was. Hence such a mission takes place without a separation, having only distinction of origin.
Reply to Objection 3: This objection rests on the idea of mission according to local motion, which is not in God.
Whether mission is eternal, or only temporal?
Objection 1: It would seem that mission can be eternal. For Gregory says (Hom. xxvi, in Ev.), "The Son is sent as He is begotten." But the Son's generation is eternal. Therefore mission is eternal.
Objection 2: Further, a thing is changed if it becomes something temporally. But a divine person is not changed. Therefore the mission of a divine person is not temporal, but eternal.
Objection