Sanctify them by the truth; Your word is truth.
17. Sanctify them by thy truth. This sanctification includes the kingdom of God and his righteousness; that is, when God renews us by his Spirit, and confirms in us the grace of renewal, and continues it to the end. He asks, first, therefore, that the Father would sanctify the disciples, or, in other words, that he would consecrate them entirely to himself, and defend them as his sacred inheritance.
The next thing he prayed for for them was that they might be sanctified; not only kept from evil, but made good. I. Here is the petition (Joh 17:17): Sanctify them through thy truth, through thy word, for thy word is truth; it is true - it is truth itself. He desires they may be sanctified, 1. As Christians.
Commenting on John 17:17-19
As thou hast sent me into the world,.... Which does not suppose inequality of nature, nor change of place, nor any force upon him, nor disrespect unto him, or a state of separation from his Father; but that he was before he was sent; that he was a person, a divine distinct person from his Father; and designs the manifestation of him in human nature...