Augustine of Hippo
Catena Aurea · Johannesevangelium 10
Then the Jews took up stones again to stone him. Jesus answered them, Many good works have I shewed you from my Father; for which of those works do ye stone me? The Jews answered him, saying, For a good work we stone thee not; but for blasphemy; and because that thou, being a man, makest thyself God. Jesus answered them, Is it not written in your law, I said, Ye are gods? If he called them gods, unto whom the word of God came, and the scripture cannot be broken; Say ye of him, whom the Father hath sanctified, and sent into the world, Thou blasphemest; because I said, I am the Son of God? If I do not the works of my Father, believe me not. But if I do, though ye believe not me, believe the works: that ye may know, and believe, that the Father is in me, and I in him.
(Tract. xlviii. 10) The Son doth not say, The Father is in Me, and I in Him, in the sense in which men who think and act aright may say the like; meaning that they partake of God’s grace, and are enlightened by His Spirit. The Only-begotten Son of God is in the Father, and the Father in Him, as an equal in an equal.