John 14:10

(vii. de Trin) For what excuse was there for ignorance of the Father, or what necessity to show Him, when the Father was seen in the Son by His essential nature, while by the identity of unity, the Begotten and the Begetter are one: Believest thou not that I am in the Father and the Father in Me? (vii. de Trin) But the Father is in the Son, and the Son in the Father, not by a conjunction of two harmonizing essences, nor by a nature grafted into a more capacious substance as in material bodies, in which it is impossible that what is within can be made external to that which contains it; but by the birth of a nature which is life from life; forasmuch as from God nothing but God can be born. (v. de Trin) The unchangeable God follows, so to speak, His own nature, by begetting unchangeable God. Nor does the perfect birth of unchangeable God from unchangeable God forsake His own nature. We understand then here the nature of God subsisting in Him, since God is in God, nor besides Him who is God, can any other be God. (vii. de Trin) Wherein He neither desires Himself to be the Son, nor hides the existence of His Father's power in Him. In that He speaks, it is Himself that speaks in His own person; in that He speaks not of Himself, He witnesseth His nativity, that He is God from God.

"Believest thou not that I am in the Father?" That is, "I am seen in that Essence." "The words that I speak, I speak not of Myself," Seest thou the exceeding nearness, and the proof of the one Essence? "The Father that dwelleth in Me, He doeth the works." How, beginning with words, doth He come to works? for that which naturally followed was, that He should say, "the Father speaketh the words." But He putteth two things here, both concerning doctrine and miracles. Or it may have been because the words also were works. How then doeth He them? In another place He saith, "If I do not the works of My Father, believe Me not." How then saith He here that the Father doeth them? To show this same thing, that there is no interval between the Father and the Son. What He saith is this: "The Father would not act in one way, and I in another." Indeed in another place both He and the Father work; "My Father worketh hitherto, and I work"; showing in the first passage the unvaryingness of the works, in the second the identity. And if the obvious meaning of the words denotes humility, marvel not; for after having first said, "Believest thou not?" He then spake thus, showing that He so modeled His words to bring him to the faith; for He walked in their hearts.

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 doth the Son Himself say, "but the Father abiding in me, Himself doeth the works"? If the Father, abiding in the Son, Himself doeth 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 doeth, He doeth not without the Father; because whatever the Father doeth, He doeth not without the Son.

The Lord saith, "The words that I speak unto you, I speak not of myself: but the Father, that dwelleth in me, He doeth the works." Even His words, then, are works? Clearly so. For surely he that edifies a neighbor by what he says, works a good work. But what mean the words, "I speak not of myself," but, I who speak am not of myself? Hence He attributes what He does to Him, of whom He, that doeth them, is. For the Father is not God as born of any one else, while the Son is God, as equal, indeed, to the Father, but as born of God the Father. Therefore the former is God, but not of God; and the Light, but not of light: whereas the latter is God of God, Light of Light.

For in connection with these two clauses,-the one where it is said, "I speak not of myself;" and the other, which runs, "but the Father that dwelleth in me, He doeth the works,"-we are opposed by two different classes of heretics, who, by each of them holding only to one clause, run off, not in one, but opposite directions, and wander far from the pathway of truth. For instance, the Arians say, See here, the Son is not equal to the Father, He speaketh not of Himself. The Sabellians, or Patripassians, on the other hand, say, See, He who is the Father is also the Son; for what else is this, "The Father that dwelleth in me, He doeth the works," but I that do them dwell in myself? You make contrary assertions, and that not only in the sense that any one thing is false, that is, contrary to truth, but in this also, when two things that are both false contradict one another. In your wanderings you have taken opposite directions; midway between the two is the path you have left. You are a far longer distance apart from each other than from the very way you have both forsaken. Come hither, you from the one side, and you from the other: pass not across, the one to the other, but come from both sides to us, and make this the place of your mutual meeting. Ye Sabellians, acknowledge the Being you overlook; Arians, set Him whom you subordinate in His place of equality, and you will both be walking with us in the pathway of truth. For you have grounds on both sides that make mutual admonition a duty. Listen, Sabellian: so far is the Son from being the same as the Father, and so truly is He another, that the Arian maintains His inferiority to the Father. Listen, Arian: so truly is the Son equal to the Father, that the Sabellian declares Him to be identical with the Father. Do thou restore the personality thou hast abstracted, and thou, the full dignity thou hast lowered, and both of you stand together on the same ground as ourselves: because the one of you who has been an Arian, for the conviction of the Sabellian, never lets out of sight the personality of Him who is distinct from the Father, and the other who has been a Sabellian takes care, for the conviction of the Arian, of not impairing the dignity of Him who is equal with the Father. For to both of you He cries, "I and my Father are one." When He says "one," let the Arians listen; when He says, "we are," let the Sabellians give heed, and no longer continue in the folly of denying, the one, His equality with the Father, the other, His distinct personality. If, then, in saying, "The words that I speak unto you, I speak not of myself," He is thereby accounted of a power so inferior, that what He doeth is not what He Himself willeth; listen to what He also said, "As the Father raiseth up the dead and quickeneth them, even so the Son quickeneth whom He will." And so likewise, if in saying, "The Father that dwelleth in me, He doeth the works," He is on that account not to be regarded as distinct in person from the Father, let us listen to His other words, "What things soever the Father doeth, these also doeth the Son likewise;" and He will be understood as speaking not of one person twice over, but of two who are one. But just because their mutual equality is such as not to interfere with their distinct personality, therefore He speaketh not of Himself, because He is not of Himself and the Father also, that dwelleth in Him, Himself doeth the works, because He, by whom and with whom He doeth them, is not, save of the Father Himself.