9 I pray for them: I pray not for the world, but for them which thou hast given me; for they are thine.
[AD 407] John Chrysostom on John 17:9-13
(Hom. lxxxi) As the disciples were still sad in spite of all our Lord's consolations, henceforth He addresses Himself to the Father to show the love which He had for them; I pray for them; He not only gives them what He has of His own, but entreats another for them, as a still further proof of His love.

(Hom. lxxxi. 1) He often repeats, Thou hast given Me, to impress on them that it was all according to the Father's will, and that He did not come to rob another, but to take unto Him His own. Then to show them that this power1 had not been lately received from the Father, He adds, And all Mine are Thine, and Thine are Mine: as if to say, Let no one, hearing Me say, Them which Thou hast given Me, suppose that they are separated from the Father; for Mine are His: nor because I said, They are Thine, suppose that they are separate from Me: for whatever is His is Mine.

(Hom. lxxxi) Then He gives proof of this, I am glorified in them. If they glorify Me, believing in Me and Thee, it is certain that I have power over them: for no one is glorified by those amongst whom he has no power.

(Hom. lxxxi) And now I am no more in the world: i. e. though I no longer appear in the flesh, I am glorified by those who die for Me, as for the Father, and preach Me as the Father.

(Hom. lxxxi) Again He speaks as man: While I was with them in the world, I kept them in Thy name; i. e. by Thy help. He speaks in condescension to the minds of His disciples, who thought they were more safe in His presence.

(Hom. lxxxi) He was the only one indeed who perished then, but there were many after. None of them is lost, i. e. as far as I am concerned; as He says above more clearly; I will in no wise cast out. But when they cast themselves out, I will not draw them to Myself by dint of compulsion. It follows: And now I come to Thee. But some one might ask, Canst Thou not keep them? I can. Then why sayest Thou this? That they may have My joy fulfilled in them, i. e. that they may not be alarmed in their as yet imperfect state.

[AD 407] John Chrysostom on John 17:9
What sayest Thou? Do You teach the Father, as though He were ignorant? Do You speak to Him as to a man who knows not? What then means this distinction? Do you see that the prayer is for nothing else than that they may understand the love which He has towards them? For He who not only gives what He has of His own, but also calls on Another to do the same, shows greater love. What then is, I pray for them? Not for all the world, He says, but for them whom You have given Me. He continually puts the hast given, that they might learn that this seems good to the Father. Then, because He had said continually, they are Yours, and, You gave them unto Me, to remove any evil suspicion, and lest any one should think that His authority was recent, and that He had but now received them, what says He?
[AD 407] John Chrysostom on John 17:9
He often repeats “you have given me” to impress on them that it was all according to the Father’s will. Then … to show them that this authority was not recent or that he had just now received them, he adds, “All things that are mine are yours, and yours are mine.” … Do you see the equality of honor? By speaking this way, he removes any suspicion that they are either separated from the Father’s power or that, before this, they had been separate from the power of the Son.

[AD 430] Augustine of Hippo on John 17:9-13
(Tr. cvi) When He adds, I pray not for the world, by the world He means those who live according to the lust of the world, and have not the lot to be chosen by grace out of the world, as those had for whom He prayed: But for them which Thou hast given Me. It was because the Father had given Him them, that they did not belong to the world. Nor yet had the Father, in giving them to the Son, lost what He had given: For they are Thine.

(Tr. cvi. 6) It is sufficiently apparent from hence, that all things which the Father hath, the Only-Begotten Son hath; hath in that He is God, born from the Father, and equal with the Father; not in the sense in which the elder son is told, All that I have is thine. (Luke 15:31) For all there means all creatures below the holy rational creature, but here it means the very rational creature itself, which is only subjected to God. Since this is God the Father's, it could not at the same time be God the Son's, unless the Son were equal to the Father. For it is impossible that saints, of whom this is said, should be the property of any one, except Him who created and sanctified them. When He says above in speaking of the Holy Spirit, All things that the Father hath are Mine, (c. 16:15) He means all things which pertain to the divinity of the Father; for He adds, He (the Holy Ghost) shall receive of Mine; and the Holy Ghost would not receive from a creature which was subject to the Father and the Son.

(Tr. cvii. 3) He speaks of this as already done, meaning that it was predestined, and sure to be. But is this the glorifying of which He speaks above, And now, O Father, glorify Thou Me with Thine own Self? If then with Thyself, what meaneth here, In them? Perhaps that this very thing, i. e. His glory with the Father, was made known to them, and through them to all that believe.

(Tr. cvii. 4) At the time at which He was speaking, both were still in the world. Yet we must not understand, I am no more in the world, metaphorically of the heart and life; for could there ever have been a time when He loved the things of the world? It remains then that He means that He was not in the world, as He had been before; i. e. that He was soon going away. Do we not say every day, when any one is going to leave us, or going to die, such an one is gone? This is shown to be the sense by what follows; for He adds, And now I come to Thee. And then He commends to His Father those whom He was about to leave: Holy Father, keep through Thine own name those whom Thou hast given Me. As man He prays God for His disciples, whom He received from God. But mark what follows: That they may be one, as We are: He does not say, That they may be one with Us, as We are one; but, that they may be one: that they may be one in their nature, as We are one in Ours. For, in that He was God and man in one person, as man He prayed, as God He was one with Him to Whom He prayed.

(iv. de Trin. c. ix) He does not say, That I and they maybe one, though He might have said so in the sense, that He was the head of the Church, and the Church His body; not one thing, but one person: the head and the body being one Christ. But showing something else, viz. that His divinity is consubstantial with the Father, He prays that His people may in like manner be one; but one in Christ, not only by the same nature, in which mortal man is made equal to the Angels, but also by the same will, agreeing most entirely in the same mind, and melted into one Spirit by the fire of love. This is the meaning of, That they may be one as We are: viz. that as the Father and the Son are one not only by equality of substance, but also in will, so they, between whom and God the Son is Mediator, may be one not only by the union of nature, but by the union of love.

(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.

(Tr. cvii) Or thus: That they might have the joy spoken of above: That they may be one, as We are one. This His joy, i. e. bestowed by Him, He says, is to be fulfilled in them: on which account He spoke thus in the world. This joy is the peace and happiness of the life to come. He says He spoke in the world, though He had just now said, I am no more in the world. For, inasmuch as He had not yet departed, He was still here; and inasmuch as He was going to depart, He was in a certain sense not here.

[AD 430] Augustine of Hippo on John 17:9
When the Lord was speaking to the Father of those whom he already had as disciples, he said this also among other things: “I pray for them. I pray not for the world but for those whom you have given me.” By the world, he now wishes to be understood those who live according to the lust of the world and who do not stand in the gracious lot of those who were to be chosen by him out of the world. And so he says he prays not for the world but for those whom the Father has given him. For by the very fact of their having already been given to him by the Father, they have ceased belonging to that world for which he refrains from praying. And then he adds, “For they are yours.” The Father did not lose those whom he gave when he gave them to the Son. After all, the Son still goes on to say, “And all mine are yours, and yours are mine.”

[AD 444] Cyril of Alexandria on John 17:9
CHAPTER VIII. That nothing which is spoken of as belonging to the Father will be excluded from the kingdom of the Son, for Both alike rule over all.

He once more mediates as Man, the Reconciler and Mediator of God and men; and being our truly great and all-holy High Priest, by His own prayers He appeases the anger of His Father, sacrificing Himself for us. For He is the Sacrifice, and is Himself our Priest, Himself our Mediator, Himself a blameless Victim, the true Lamb Which taketh away the sin of the world. The Mosaic ceremonial was then, as it were, a type and transparent shadowing forth of the mediation of Christ, shown forth in the last times, and the high priest of the Law indicated in his own person that Priest Who is above the Law. For the things of the Law are shadows of the truth. For the inspired Moses, and with him the eminent Aaron, continually intervened between God and the assembly of the people; at one time deprecating God's anger for the transgressions of the people of Israel, and inviting mercy from above upon them when they were faint; at another, praying and blessing the people, and ordering sacrifices according to the Law and offerings of gifts besides in their appointed order, sometimes for sins, and sometimes thank-offerings for the benefits they felt that they had received from God. But Christ Who manifested Himself in the last times above the types and figures of the Law, at once our High Priest and Mediator, prays for us as Man; and at the same time is ever ready to cooperate with God the Father, Who distributes good gifts to those who are worthy. Paul showed us this most plainly in the words: Grace to you and peace from God our Father, and the Lord Jesus Christ. He then prays for us as Man, and also unites in distributing good gifts to us as God. For He, being a holy High Priest, blameless and undefiled, offered Himself not for His own weakness, as was the custom of those to whom was allotted the duty of sacrificing according to the Law, but rather for the salvation of our souls, and that once for all, because of our sin, and is an Advocate for us: And He is the propitiation for our sins, as John saith; and not for ours only, but also for the whole world.

But perhaps someone, wishing to controvert what we have said, will exclaim, "Is not what the disciple says quite contrary to the Saviour's words?" For our Lord Jesus Christ expressly in these words repudiates the necessity of praying to God for the whole world, while the wise John affirmed quite the contrary. For he maintains that the Saviour will be the Advocate and propitiation, not merely for our sins, but also for the sins of the whole world. It is not hard to find the solution to this difficulty, or to say how the disciple may be seen to be in accord with his Master's saying. For the blessed John, as he was a Jew and of the Jews, that some might not perhaps think that our Lord was merely an Advocate for the Israelites, and not in any sense for the rest of the nations scattered over the whole world, though destined to distinguish themselves by faith on Him and to be shortly called to knowledge of salvation through Christ, is perforce impelled to declare that our Lord will not only be the propitiation for the race of Israel, but also for the whole world; that is, those of every nation and kindred, who shall be called through faith to righteousness and sanctification. Our Lord Christ distinguishes from His own those who are otherwise minded, and who have chosen to insult Him by stubborn disobedience; and, referring to those who are prone to listen to His Divine commands, and who have already submitted, as it were, the necks of the hearts, and well-nigh bound round them the yoke of submission to God, said that for them only it was most fitting for Him to pray. For to those only, whose Mediator and High Priest He is, He thought it meet to bring the blessings of His mediation; to those, I mean, who, He says, were given to Himself, but were the Father's, as there is no other way of fellowship with God save by the Son. And He will Himself teach you this in the words: No one cometh unto the Father, but by Me. For observe how the Father, when He gave to His Son those of whom He speaks, won them over to Himself. And the Apostle, who was so conversant with the sacred writings, knowing this well, says: God was in Christ, reconciling the world unto Himself. For when Christ acted as Mediator, and received those who come to Him by faith, and brought them aright through Himself to the Father, the world was reconciled to God. Therefore also the Prophet Isaiah taught us, in anticipation, to choose peace with God, in Christ: Let us have peace with Him; let us who are in the way have peace. For if we banish from our hearts whatsoever estrangeth us from the love of Christ, I mean the base lasciviousness which hankers after sinful pleasure and is ever inclined to the delights of the world, and is besides the mother and nurse of all vice, and leads us widely astray, we shall become united in fellowship with Christ, and shall make peace with God, being joined to the Father Himself through the Son, inasmuch as we receive in ourselves the Word That was begotten of Him, and cry out in the Spirit, Abba, Father.
[AD 444] Cyril of Alexandria on John 17:9
Christ, who manifested himself in the last times above the types and figures of the Law, at once our high priest and mediator, prays for us as man. And at the same time he is ever ready to cooperate with God the Father, who distributes good gifts to those who are worthy. Paul showed us this most plainly in the words “grace to you and peace from God our Father and the Lord Jesus Christ.” Christ, then, prays for us as man and also unites in distributing good gifts to us as God. For he, being a holy high priest, blameless and undefiled, offered himself—not for his own weakness, as was the custom of those to whom was allotted the duty of sacrificing according to the Law, but rather for the salvation of our souls.

[AD 1107] Theophylact of Ohrid on John 17:9
To make it clear that everything He has been saying to the Father is purely for the benefit of His disciples, the Lord now adds, “I pray for them, and not for the world. I love and take care of My disciples; I bestow upon them what is Mine; and I beseech You, Father, to protect them. I do not pray to You on behalf of coarse, vulgar men who think about nothing except this world; I pray … for them whom Thou hast given Me; for they are Thine.” When the Lord says, whom Thou hast given Me, this does not mean that the Father only recently gave Him authority over these men. It does not mean that there was a time when the Father had this authority, but the Son did not, nor that the Father lost this authority when that the Son gained it. To make this clear, the Lord declares, “All Mine are Thine, and Thine are Mine. For as long as they have been Yours, they have been Mine, for all Thine are Mine. They did not come into My possession a moment ago. And the fact that they are Mine in no way implies that they are no longer Yours. They have not been taken from You, for all Mine are Thine. Furthermore, I am glorified in them, which means, “I share the glory of My Father, just as the son of an emperor shares his father’s authority and glory: both are held in equal honor by their subjects.” If the Son were less than the Father, He would not dare to say, All Thine are Mine. The master owns everything that his servant has, while the servant owns nothing of his master’s. Here, on the contrary, what the Father has belongs to the Son, and what the Son has belongs to the Father. Thus the Son is glorified in all who belong to the Father, for the Son’s authority over all creation is equal to the Father’s.