John Chrysostom
Catena Aurea · Johannesevangelium 17
I have given them thy word; and the world hath hated them, because they are not of the world, even as I am not of the world. I pray not that thou shouldest take them out of the world, but that thou shouldest keep them from the evil. They are not of the world, even as I am not of the world. Sanctify them through thy truth; thy word is truth. As thou hast sent me into the world, even so have I also sent them into the world. And for their sakes I sanctify myself, that they also might be sanctified through the truth.
(Hom. lxxxii. 1) Above, when He said, Them whom Thou gavest Me out of the world, He meant their nature; here He means their actions. They are not of the world; because they have nothing in common with earth, they are made citizens of heaven. Wherein He shews His love for them, thus praising them to the Father. The word as when used with respect to Him and the Father expresses likeness of nature; but between us and Christ there is immense distance. Keep them from the evil, i. e. not from dangers only, but from falling away from the faith.