Adam Clarke on John 17:22

And the glory which thou gavest me I have given them - That is, the power to work miracles, and to preach unadulterated truth, say some; but as our Lord is not here praying for the disciples, but for all those who should believe on him through their word, Joh 17:20, it is more natural to understand the passage thus. As Christ, according to his human nature, is termed the Son of God, he may be understood as saying: "I have communicated to all those who believe, or shall believe in me, the glorious privilege of becoming sons of God; that, being all adopted children of the same Father, they may abide in peace, love, and unity." For this reason it is said, Heb 2:11, Christ is not ashamed to call them brethren. However, our Lord may here, as in several other places, be using the past for the future; and the words may therefore be understood of the glory which they were to share with him in heaven.