Didymus the Blind — as excerpted in the Catena Aurea on John 14:22-27

“(Didym. de Spir. Sancto, l. ii. inter opera Hieron.) The Saviour affirms that the Holy Spirit is sent by the Father, in His, the Saviour’s, name; which name is the Son. Here an agreement of nature and propriety1, so to speak, of persons is shewn. The Son can come in the Father’s name only, consistently with the proper1 relationship of the Son to the Father, and the Father to the Son. No one else comes in the name of the Father, but in the name of God, of the Lord, of the Almighty, and the like. As servants who come in the name of their Lord, do so as being the servants of that Lord, so the Son who comes in the name of the Father, bears that name as being the acknowledged only-begotten Son of the Father. That the Holy Spirit then is sent in the Son’s name, by the Father, shews that He is in unity with the Son: whence He is said too to be the Spirit of the Son, and to make those sons by adoption, who are willing to receive Him. The Holy Spirit then, Who cometh in the name of the Son from the Father, shall teach them, who are established in the faith of Christ, all things; all things which are spiritual, both the understanding of truth, and the sacrament of wisdom. But He will teach not like those who have acquired an art or knowledge by study and industry, but as being the very art, doctrine, knowledge itself. As being this Himself, the Spirit of truth will impart the knowledge of divine things to the mind.”