But if I do, though you believe not me, believe the works: that you may know, and believe, that the Father is in me, and I in him.
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Cornelius a Lapide
AD 1637
But if I do, &c, and I in the Father, working by the same Godhead and omnipotence which I have received from Him. Accordingly S. Augustine, Cyril, Leontius, &c, consider that the words, "I in the Father and the Father in Me," mean the same as "I and the Father are one." S. Augustine says (in loc.), "We are in God, and God in us. But can we say, "I and God are one?" Thou art in God, because God containeth thee; God is in thee, because thou art made the temple of God. But because thou art in God, and God in thee, canst thou therefore say, "He who seeth God seeth Me," as the only Begotten said, "He that seeth Me, seeth the Father also, and I and the Father are one?" Recognise what is proper to the Lord, and also the duty of the servant. What is proper to the Lord is equality with the Father; the duty of the servant is to be partaker of the Saviour."
Therefore, as there is but One Godhead in Father and Son and Holy Spirit, we say that the Father is seen in the Son, and the Son in the Father. And it is necessary to know this other point also, that it is not the wishing the same things as the Father, nor the possessing one will with Him, that makes the Son say: I am in the Father, and the Father in Me, and: I and the Father are One; but because, being the genuine Offspring of the Essence of the Father, He shews forth the Father in Himself, and Himself also is shewn forth in the Father. For He says that He wills and speaks and effects the same things as the Father, and easily performs what He wishes, even as the Father doth, in order that He may be acknowledged in all respects Consubstantial with Him, and a true Fruit of His Essence; and not merely as having a relative unity with Him, only in similarity of will and the laws of love; which unity we say belongs also to His creatures.