(4) Whether it is the cause of our predestination? _______________________
FIRST ARTICLE [III, Q. 24, Art. 1]
Whether It Is Befitting That Christ Should Be Predestinated?
Objection 1: It would seem unfitting that Christ should be predestinated. For the term of anyone's predestination seems to be the adoption of sons, according to Eph. 1:5: "Who hath predestinated us unto the adoption of children." But it is not befitting to Christ to be an adopted Son, as stated above (Q. 23, A. 4). Therefore it is not fitting that Christ be predestinated.
Obj. 2: Further, we may consider two things in Christ: His human nature and His person. But it cannot be said that Christ is predestinated by reason of His human nature; for this proposition is false—"The human nature is Son of God." In like manner neither by reason of the person; for this person is the Son of God, not by grace, but by nature: whereas predestination regards what is of grace, as stated in the First Part, Q. 23, AA. 2, 5. Therefore Christ was not predestinated to be the Son of God.
Obj. 3: Further, just as that which has been made was not always, so also that which was predestinated; since predestination implies a certain antecedence. But, because Christ was always God and the Son of God, it cannot be said that that Man was "made the Son of God." Therefore, for a like reason, we ought not to say that Christ was "predestinated the Son of God."
On the contrary, The Apostle says, speaking of Christ (Rom. 1:4): "Who was predestinated the Son of God in power."
I answer that, As is clear from what has been said in the First Part (Q. 23, AA. 1, 2), predestination, in its proper sense, is a certain Divine preordination from eternity of those things which are to be done in time by the grace of God. Now, that man is God, and that God is man, is something done in time by God through the grace of union. Nor can it be said that God has not from eternity pre-ordained to do this in time: since it would follow that something would come anew into the Divine Mind. And we must needs admit that the union itself of natures in the Person of Christ falls under the eternal predestination of God. For this reason do we say that Christ was predestinated.
Reply Obj. 1: The Apostle there speaks of that predestination by which we are predestinated to be adopted sons. And just as Christ in a singular manner above all others is the natural Son of God, so in a singular manner is He predestinated.
Reply Obj. 2: As a gloss [*From St. Augustine, De Praed. Sanct. xv] says on Rom. 1:4, some understood that predestination to refer to the nature and not to the Person—that is to say, that on human nature was bestowed the grace of being united to the Son of God in unity of Person.