Believe me that I am in the Father, and the Father in me: or else believe me for the very works' sake.
All Commentaries on John 14:11 Go To John 14
Tertullian of Carthage
AD 220
But the Word was formed by the Spirit, and (if I may so express myself) the Spirit is the body of the Word. The Word, therefore, is both always in the Father, as He says, "I am in the Father; ".
He ought rather to have said: "Believest thou not that I am the Father? "With what view else did He so emphatically dwell on this point, if it Were not to clear up that which He wished men to understand-namely, that He was the Son? And then, again, by saying, "Believest thou not that I am in the Father, and the Father in me"