John Chrysostom

"And the Father is with Me." That they may not deem the "who sent Me" to be a mark of inferiority, He saith, "is with Me"; the first belongeth to the Dispensation, the second to the Godhead. "And He hath not left Me alone," for I do always those things that please Him. Again He hath brought down His discourse to a humbler strain, continually setting Himself against that which they asserted, that He was not of God, and that He kept not the Sabbath. …

Homily on the Gospel of John 53 ↗

Cyril of Alexandria

Herein He shows clearly that He interprets the Counsel of God the Father, Himself having none other than is in Him (how could He? for He is Himself the Living and Hypostatic Counsel and Will of Him Who begat Him, as is said in the Book of the Psalms by one of the Saints, In Thy Counsel Thou guidedst me, and again, Lord by Thy Will Thou gavest might to my beauty : for in Christ are all good things to them that love Him) but as bringing forth unto our knowledge the things that are in God the Father. …

Commentary on the Gospel of John, Book 5 ↗

Theophylact of Ohrid

Then, lest they think that the sending and the embassy imply subordination, He says that My Father is "with Me." Although He sent Me as a Man, I am inseparable from Him, and He is with Me, as God with God. After this He again descends to humble speech and says: "He has not left Me alone," because I do what is pleasing to Him. He speaks so humbly for the sake of the Jews. They said that He was not from God because He did not keep the Sabbath. …

Commentary on John ↗

Augustine of Hippo

And though both are together, yet one is sent, the other sends. For the mission is the incarnation; and the incarnation is of the Son only, not of the Father. He says then, He that sent Me, meaning, By whose Fatherly authority I am made incarnate. The Father however, though He sent the Son, did not withdraw from Him, as He proceeds to say: The Father hath not left Me alone. For it could not be that where He sent the Son, there the Father was not; He who says, I fill heaven and earth. (Jer. …

Catena Aurea by Aquinas ↗

Thomas Aquinas

So that we do not think that the Son was sent by the Father in such a way as to be separated from the Father, he teaches, thirdly, that they must believe that he is inseparable from the Father when he says, he who sent me, the Father, is with me, by a unity of essence: "I am in the Father, and the Father is in me" (14:10). And the Father is also with me by a union of love, "The Father loves the Son, and shows him everything that he does" (5:20). …

Commentary on John ↗

Bonaventure

"And he who sent me is with me," on account of the unity of essence, in which there is no division; below in the fourteenth chapter: "Do you not believe that I am in the Father, and the Father is in me?" "And he has not left me alone," through a discordant will: "because I always do the things that are pleasing to him." Whence the Son cannot be left by the Father, because he can neither disagree with him nor displease him; Matthew 3: "This is my beloved Son, in whom I am well pleased." On the contrary, sinners are left by the Lord, …

Commentary on John, Chapter 8 ↗