Gregory the Great
Catena Aurea · Johannesevangelium 1
And John bare record, saying, I saw the Spirit descending from heaven like a dove, and it abode upon him. And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost. And I saw, and bare record that this is the Son of God.
(Moral. liv. [90.]) He saith, Abode upon Him: for the Holy Spirit visits all the faithful; but on the Mediator alone does He abide for ever in a peculiar manner; never leaving the Son’s Humanity, even as Ho proceeds Himself from the Son’s Divinity. But when the disciples are told of the same Spirit, (John 14:17.) He shall dwell with you, how is the abiding of the Spirit a peculiar sign of Christ? This will appear if we distinguish between the different gifts of the Spirit. As regards those gifts which are necessary for attaining to life, the Holy Spirit ever abides in all the elect; such are gentleness, humility, faith, hope, charity: but with respect to those, which have for their object, not our own salvation, but that of others, he does not always abide, but sometimes withdraws, and ceases to exhibit them; that men may be more humble in the possession of His gifts. But Christ had all the gifts of the Spirit, uninterruptedly always.