6 Return then with me to what I was saying, in case it is so to be understood that we may both escape from the question. For I see how I, according to the catholic faith, may escape without tripping or stumbling; while you, on the other hand, shut in on every side, art seeking a way of escape. See by what way you have entered. Perhaps you have not understood this that I said, See by what way you have entered: hear Himself saying, “I am the door.” Not without cause, then, are you seeking how you may get out; and this only you find, that you have not entered by the door, but fell in over the wall.
Therefore raise yourself up from your fall how you can, and enter by the door, that you may go in without stumbling, and go out without straying. Come by Christ, not bringing forward of your own heart what you may say; but what He shows, that speak. Behold how the catholic faith gets clear of this question. The Son walked upon the sea, planted the feet of flesh on the waves: the flesh walked, and the divinity directed. But when the flesh was walking and the divinity directing, was the Father absent?
If absent, how does the Son Himself say, “but the Father abiding in me, Himself does the works?” If the Father, abiding in the Son, Himself does His works, then that walking upon the sea was made by the Father, and through the Son. Accordingly, that walking is an inseparable work of Father and Son. I see both acting in it. Neither the Father forsook the Son, nor the Son left the Father. Thus, whatever the Son does, He does not without the Father; because whatever the Father does, He does not without the Son.
Source: Tractates on the Gospel of John (New Advent)