Albert Barnes on John 17:22

And the glory, &c. The honour which thou hast conferred on me by admitting me to union with thee, the same honour I have conferred on them by admitting them to like union with me.

May be one, even as we are one. Not in nature, or in the mode of existence-for this was not the subject of discourse, and would be impossible--but in feeling, in principle, in purpose. Evincing, as the Father and the Son had always done, the same great aim and plan; not pursuing different interests, or counteracting each other's purposes, or forming parties, but seeking the same ends by the same means. This is the union between the Father and the Son. Always, in the creation, preservation, and redemption of the world, the Father and the Son have sought the same object, and this is to be the model on which Christians should act.

(a) "And the glory which thou gavest" 2Cor 3:15