John Chrysostom
"I pray for them." What are You saying? Do You teach the Father as though He did not know? Do You speak as though conversing with a man who is ignorant? What, indeed, does this distinction mean? Do you see that He prays for no other reason than to show what love He has for them? He who not only gives what is His own, but also entreats Another for the same thing, truly displays great love. What, then, does "I pray for them; not for all" mean? It means, not for the world, but for those whom You have given Me. He often repeats the word, "You have given," to show that this is pleasing to the Father. Then, because He had often said, "They are Yours," and, "You have given them to Me," someone might think His authority was recent and that He had only now received them.
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To remove this wrong thought, He says, "All Mine are Yours, and Yours are Mine; and I am glorified in them" (Jn 17:10). Do you see the equality of honor? When you hear, "You have given them to Me," do not think they are now alienated from the Father's authority. Nor should you think that earlier they were alienated from the Son. He destroyed both thoughts by these words. It is as though He said: when you hear, "You have given them to Me," do not think they become strangers to the Father. For all Mine belongs to Him. Likewise, when you hear, "They were Yours," do not think they were strangers to Me. For all that belongs to Him is Mine. Thus, "You have given" is said only by way of accommodation. All that the Father has belongs to the Son, and all that the Son has belongs to the Father. This cannot be said even of the Son according to His humanity. It is said of Him because He is greater than man. Everyone knows that what belongs to the lesser belongs also to the greater, but not the reverse. Yet here the reverse is also said, and this shows equality. Christ also showed this elsewhere when, speaking of knowledge, He said, "All that the Father has is Mine" (Jn 16:15). The expressions "You have given Me" and the like show that He did not come as a stranger and draw them to Himself, but received them as His own. Then He gives the reason and proof, saying, "And I am glorified in them." That is, I have authority over them. Or else, they will glorify Me, believing in You and in Me, and will glorify Us equally. If He were not glorified in them equally, what belongs to the Father would not belong to Him. No one is glorified by that over which he has no authority.