Believe you not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwells in me, he does the works.
All Commentaries on John 14:10 Go To John 14
Tertullian of Carthage
AD 220
If, indeed, He meant the Father to be understood as the same with the Son, by saying, "He who seeth me seeth the Father "how is it that He adds immediately afterwards, "Believest thou not that I am in the Father, and the Father in me? ".
And yet He omitted not to explain how the Father was in the Son and the Son in the Father. "The words "says He, "which I speak unto you, are not mine"