John 17:9

I pray for them (that Thou wouldst make them grow in the knowledge and love of Thee and Me): I pray not for the world, but for them which Thou hast given Me; for they are Thine. And hence heretics in the time of S. Augustine (making a wrong use of his writings) taught that Christ prayed only for the predestinate; and that therefore whatever sins they committed could not hurt them, and that no good works could be of avail for the reprobate. This heresy was renewed by John Huss and Martin Luther. But Scripture teaches us that Christ was born and died for all men, even the reprobate, or rather for those who would be reprobated on account of their sins. See Luke 23:34; 2 Corinthians 5:14-15; John 1:9; 1 Timothy 2:4. Because Christ, for His part, provides all men with the necessary means for salvation. His sacraments are constituted for all. His Apostles He sent to all nations. He offers His teaching and His grace to all. He has sufficiently done His part for their salvation. But He here specially prays for His faithful ones, and with effectual prayer, for God to keep them in the faith and grace which have been given them. So S. Augustine, who elsewhere says, I pray not for those who are likely to the end of their lives to remain (in) the world, that is, to continue unbelieving and ungodly. (2.) It is better, and more to the point, to suppose that Christ here prayed for the Apostles only. For after He had prayed for them, He prayed for those who would afterwards believe through their preaching (Joh 17:20). He therefore did not pray for them. Nor did He here pray for the world, though He prayed afterwards for His murderers. And by the power of that prayer many of them were converted at the preaching of S. Peter. But in this place He did not pray for them, but, as I said, only for the Apostles, the future propagators of the Gospel, and for the heads of the Church. Ver. 10. And all Mine are Thine, and Thine are Mine. I am about to depart, and I commend My disciples to Thee; because they are Thine, and elected by Thee to eternal life and committed to My care. But they are still Thine, though given to Me. And though, as I say, they were given to Me, yet they were ever Mine; for all Thou hast are Mine, by reason of our unity of Essence. So SS. Cyril and Chrysostom.

And I am glorified in them. Because they believe in Me, love Me, worship, adore, and preach Me as the Messiah and the Son of God. So Cyril and Chrysostom.

Morally. Learn hence that God and Christ are glorified in us, when we do what is right, and especially when we preach His faith, and convert unbelievers and ungodly men. S. Augustine (in loc.) takes it otherwise, putting the matter as past, instead of its being yet to come. For what is past is a matter of greater certainty. I pray for the Apostles, for I am about to be glorified by them, when they preach My Godhead in all the world.