Augustine of Hippo
Catena Aurea · Johannesevangelium 14
If ye love me, keep my commandments. And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.
(contr. Serm. Arrian. c. xix.) Comforter, the title of the Holy Spirit, the third Person in the Trinity, the Apostle applies to God: God that comforteth those that are cast down, comforted us. (2 Cor. 7:6) The Holy Spirit therefore Who comforts those that are cast down, is God. Or if they will have this said by the Apostle of the Father or the Son, let them not any longer separate the Holy Spirit from the Father and the Son, in His peculiar office of comforting.