Tractates on the Gospel of John

³ What says He then to them? “Then answered Jesus, and said unto them,” being indignant because He made Himself equal with God, “Verily, verily, I say unto you, The Son cannot do anything of Himself, but what He sees the Father doing.” What the Jews answered to these words is not written: and perhaps they said nothing. Certain, however, who wish to be esteemed Christians, are not silent, but from these words somehow conceive certain opinions in contradiction to us, which are not to be despised, both for their and for our sakes.

The Arian heretics, namely, while they assert that the Son, who took upon Himself flesh, is less than the Father, not by the flesh, but before taking flesh, and not of the same substance as the Father, take a handle of misrepresentation from these words, and reply to us: “You see that the Lord Jesus, observing the Jews to be moved with indignation at his making himself equal to God the Father, subjoined such words as these, to show that he was not equal with God. For the Jews,” say they, “were provoked against Christ, because he made him self equal with God; and Christ, wishing to cure them of this impression, and to show them that the Son is not equal to the Father, that is, to God, says this, as if he said, Why are you angry?

Why are you indignant? I am not equal to God, since 'the Son cannot do anything of himself, except what he sees the Father doing.' Now,” say they, “he who 'cannot do anything of himself, but what he sees the Father doing,' is surely less, not equal.”