John 17:12

"While I was with them in the world, I kept them in Thy Name." Again He speaketh as a man and as a Prophet, since nowhere doth He appear to have done anything by the Name of God.

"Those that Thou gavest Me I have kept, and none of them is lost, but the son of perdition, that the Scripture might be fulfilled." And in another place He saith, "Of all that Thou gavest Me, I will surely lose nothing." (c. vi. 39.) Yet not only was he lost, but also many afterwards; how then saith He, "I will in nowise lose"? "For My part, I will not lose." So in another place, declaring the matter was more clearly, He said, "I will in nowise cast out." (c. vi. 37.) "Not through fault of Mine, not because I either instigate or abandon them; but if they start away of themselves, I draw them not by necessity."

But after having said that "none of them was lost but the son of perdition," He added, "that the Scripture might be fulfilled." Of what Scripture doth He speak? That which foretelleth many things concerning Him. Not that He perished on that account, in order that the Scripture might be fulfilled. But we have before spoken at length on this point, that this is the peculiar manner of Scripture, which puts things which fall out in accordance with it, as though they were caused by it. And it is needful to enquire exactly into all, both the manner of the speaker, his argument, and the laws of Scripture, if at least we are minded not to draw wrong conclusions. For, "Brethren, be not children in your minds." (1 Cor. xiv. 20.)

(Tr. cvii. 6) The Son as man kept His disciples in the Father's name, being placed among them in human form: the Father again kept them in the Son's name, in that He heard those who asked in the Son's name. But we must not take this carnally, as if the Father and Son kept us in turns, for the Father, Son, and Holy Ghost guard us at the same time: but Scripture does not raise us, except it stoop to us. Let us understand then that when our Lord says this, He is distinguishing the persons, not dividing the nature, so that when the Son was keeping His disciples by His bodily presence, the Father was waiting to succeed Him on His departure; but both kept them by spiritual power, and when the Son withdrew His bodily presence, He still held with the Father the spiritual keeping. For when the Son as man received them into His keeping, He did not take them from the Father's keeping, and when the Father gave them into the Son's keeping, it was to the Son as man, who at the same time was God. Those that Thou gavest Me I have kept, and none of them is lost but the son of perdition; i. e. the betrayer of Christ, predestined to perdition; that the Scripture might be fulfilled, especially the prophecy in Psalm 108.

But here He proceeds: "While I was with them, I kept them in Thy name." Since I am coming, He says, to Thee, keep them in Thy name, in which I myself have kept them while I was with them. In the Father's name, the Son as man kept His disciples, when placed side by side with them in human presence; but the Father also, in the name of the Son, kept those whom He heard and answered when praying in the name of the Son. For to them had it also been said by the Son Himself: "Verily, verily, I say unto you, whatsoever ye shall ask the Father in my name, He will give it you." But we are not to take this in any such carnal way, as that the Father and Son keep us in turn, with an alternation in the guardianship of both in guarding us, as if one succeeded when the other departed; for we are guarded all at once by the Father, and Son, and Holy Spirit, who is the one true and blessed God. But Scripture does not exalt us save by descending to us: as the Word, by becoming flesh, came down to lift us up, and fell not so as to remain Himself in the depths. If we have known Him who thus descendeth, let us rise with Him who lifteth us up; and let us understand, when He speaks thus, that He is marking a distinction in the persons, without making any separation of the natures. While, therefore, the Son in bodily presence was keeping His disciples, the Father was not waiting the Son's departure in order to succeed to the guardianship, but both were keeping them by Their spiritual power; and when the Son withdrew from them His bodily presence, He retained along with the Father the spiritual guardianship. For when the Son also as man assumed the office of their guardian, He did not withdraw them from the Father's guardianship; and when the Father gave them to the guardianship of the Son, in the very giving He acted not apart from Him to whom He gave them, but gave them to the Son as man, yet not apart from that same Son Himself as God.