Catena Aurea on John 14:15–17: Didymus the Blind

But the Holy Ghost was another Comforter: differing not in nature, but in operation. For whereas our Saviour in His office of Mediator, and of Messenger1, and as High Priest, made supplication for our sins; the Holy Ghost is a Comforter in another sense, i. e. as consoling our griefs. But do not infer from the different operations of the Son and the Spirit, a difference of nature. For in other places we find the Holy Spirit performing the office of intercessor2 with the Father, as, The Spirit Himself intercedeth for us. (Rom. 8:26) And the Saviour, on the other hand, pours consolation into those hearts that need it: as in Maccabees, He strengthened those of the people that were brought low. (1 Macc. 14:15)