John Chrysostom — as excerpted in the Catena Aurea on John 14:15-17

“(Hom. lxxv. 1) That He may abide with you for ever. The Spirit does not depart even at death. He intimates too that the Holy Ghost will not suffer death, or go away, as He has done. But that the mention of the Comforter might not lead them to expect another incarnation, a Comforter to be seen with the eye, He adds, Even the Spirit of truth, Whom the world cannot receive, because it seeth Him not, neither knoweth Him.”