The Texts of Scripture Explained Respecting the Subjection of the Son to the Father, Which Have Been Misunderstood. Christ Will Not So Give Up the Kingdom to the Father, as to Take It Away from Himself. The Beholding Him is the Promised End of All Actions. The Holy Spirit is Sufficient to Our Blessedness Equally with the Father
15 As for that which the apostle says, “And when all things shall be subdued unto Him, then shall the Son also Himself be subject unto Him that put all things under Him:” either the text has been so turned, lest any one should think that the “fashion” of Christ, which He took according to the human creature, was to be transformed hereafter into the Divinity, or (to express it more precisely) the Godhead itself, who is not a creature, but is the unity of the Trinity,— a nature incorporeal, and unchangeable, and consubstantial, and co-eternal with itself; or if any one contends, as some have thought, that the text, “Then shall the Son also Himself be subject unto Him that put all things under Him,” is so turned in order that one may believe that very “subjection” to be a change and conversion hereafter of the creature into the substance or essence itself of the Creator, that is, that that which had been the substance of a creature shall become the substance of the Creator;— such an one at any rate admits this, of which in truth there is no possible doubt, that this had not yet taken place, when the Lord said, “My Father is greater than I.” For He said this not only before He ascended into heaven, but also before He had suffered, and had risen from the dead. But they who think that the human nature in Him is to be changed and converted into the substance of the Godhead, and that it was so said, “Then shall the Son also Himself be subject unto Him that put all things under Him,”— as if to say, Then also the Son of man Himself, and the human nature taken by the Word of God, shall be changed into the nature of Him who put all things under Him—must also think that this will then take place, when, after the day of judgment, “He shall have delivered up the kingdom to God, even the Father.” And hence even still, according to this opinion, the Father is greater than that form of a servant which was taken of the Virgin. But if some affirm even further, that the man Christ Jesus has already been changed into the substance of God, at least they cannot deny that the human nature still remained, when He said before His passion, “For my Father is greater than I;” whence there is no question that it was said in this sense, that the Father is greater than the form of a servant, to whom in the form of God the Son is equal. Nor let any one, hearing what the apostle says, “But when He says all things are put under Him, it is manifest that He is excepted which did put all things under Him,” think the words, that He has put all things under the Son, to be so understood of the Father, as that He should not think that the Son Himself put all things under Himself. For this the apostle plainly declares, when he says to the Philippians, “For our conversation is in heaven; from whence also we look for the Saviour, the Lord Jesus Christ: who shall change our vile body, that it may be fashioned like His glorious body, according to the working whereby He is able even to subdue all things unto Himself.” For the working of the Father and of the Son is indivisible. Otherwise, neither has the Father Himself put all things under Himself, but the Son has put all things under Him, who delivers the kingdom to Him, and puts down all rule and all authority and power. For these words are spoken of the Son: “When He shall have delivered up,” says the apostle, “the kingdom to God, even the Father; when He shall have put down all rule, and all authority, and all power.” For the same that puts down, also makes subject.
16. Neither may we think that Christ shall so give up the kingdom to God, even the Father, as that He shall take it away from Himself. For some vain talkers have thought even this. For when it is said, “He shall have delivered up the kingdom to God, even the Father,” He Himself is not excluded; because He is one God together with the Father. But that word “until” deceives those who are careless readers of the divine Scriptures, but eager for controversies. For the text continues, “For He must reign, until He has put all enemies under His feet;” as though, when He had so put them, He would no more reign. Neither do they perceive that this is said in the same way as that other text, “His heart is established: He shall not be afraid, until He see His desire upon His enemies.” For He will not then be afraid when He has seen it. What then means, “When He shall have delivered up the kingdom to God, even the Father,” as though God and the Father has not the kingdom now? But because He is hereafter to bring all the just, over whom now, living by faith, the Mediator between God and men, the man Christ Jesus, reigns, to that sight which the same apostle calls “face to face;” therefore the words, “When He shall have delivered up the kingdom to God, even the Father,” are as much as to say, When He shall have brought believers to the contemplation of God, even the Father. For He says, “All things are delivered unto me of my Father: and no man knows the Son, but the Father; neither knows any man the Father, save the Son, and he to whomsoever the Son will reveal Him.” The Father will then be revealed by the Son, “when He shall have put down all rule, and all authority, and all power;” that is, in such wise that there shall be no more need of any economy of similitudes, by means of angelic rulers, and authorities, and powers. Of whom that is not unfitly understood, which is said in the Song of Songs to the bride, “We will make you borders of gold, with studs of silver, while the King sits at His table;” that is, as long as Christ is in His secret place: since “your life is hid with Christ in God; when Christ, who is our life, shall appear, then shall you also appear with Him in glory.” Before which time, “we see now through a glass, in an enigma,” that is, in similitudes, “but then face to face.”
Source: On the Holy Trinity (New Advent)