All things that the Father has are mine: therefore said I, that he shall take of mine, and shall show it unto you.
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Cyril of Alexandria
AD 444
CHAPTER II. That His Spirit, that is, the Holy Spirit, is naturally in the Son and in His Substance, as He is also in the Substance of the Father.
The Son once more shows to us herein the complete and perfect character of the Person of the Father Himself also, and allows us to see why He said that He, being the fruit of the Father's Substance, engrosses in Himself all that belongs to It, and says that It is all His own, and with reason. For, as there is nothing to dissever or estrange the Son from the Father, so far as their complete similarity and equality is concerned, save only that He is not Himself the Father, and as the Divine Substance does not show Itself differently in the Two Persons, surely Their attributes are common, or rather identical; so that what the Father hath is the Son's, and what He That begat hath, belongs also to Him that is begotten of Him. For this reason, I think, in His watchful care over us, He has thus spoken to us concerning this. For He did not say, All things whatsoever the Father hath I have also, in order to prevent our imagining He meant a mere likeness founded on similarity, only moulded by adventitious graces into conformity with the Archetype, as is the case with us; for we are after God's likeness. Rather, when He says, All things whatsoever the Father hath are Mine, He illustrates hereby the perfect union which He hath with His Father, and the meaning of their Consubstantiality existing in unchangeable attributes. And this you may see, that He clearly says elsewhere, when addressing the Father, All things that are Mine are Thine, and Thine are Mine. For surely they are identical in nature, in whom there is no severance at all, but complete and perfect essential equality and likeness. God the Father then hath, of Himself, and in Himself, His own Spirit; that is, the Holy Spirit, through Whom He dwelleth in the Saints, and reveals His mysteries to them; not as though the Spirit were called to perform a merely ministerial function (do not think this), but rather, as He is in Him essentially, and proceeds from Him inseparably and indivisibly, interpreting what is in reality His own when He interprets that which belongs to Him in Whom He exists, and from Whom He springs. For God only has union with the creation through His Son in the Spirit. And this Spirit is also an attribute of the Only-begotten, for He is Consubstantial with the Father.
Since then, He says, it is seen to be natural to God the Father to reveal Himself in His own Spirit to those who are worthy of Him, and to accomplish through Him all His purposes, and since this kind of action belongs to Me also, for this cause I said, "He receiveth of Me and will show it unto you." And let no man be perplexed when he here hears the word "receiveth," but rather let him consider the following fact, and he will do well. The things of God are spoken of in language as though God were even as we are; but this is not really the case, for His ways are superhuman. We say then that the Spirit receives of the Father and the Son the things that are Theirs in the following way; not as though at one moment He were devoid of the knowledge and power inherent in Them, and at the next hardly acquires such knowledge and power when He is conceived of as receiving from Them. For the Spirit is wise and powerful, nay, rather, absolute Wisdom and Power, not by participation in anything else, but by His own Nature. But, rather, just as we should say that the fragrance of sweet-smelling herbs which assails our nostrils is distinct from the herbs so far as their conception in thought is concerned, but proceeds from the herbs in which it originates only by being a recipient of their faculty of giving scent in order to its display, and is not in fact distinct from them, because its existence is due to, and is wrapped up in, them; even such an idea, or rather one transcending this, must you imagine about the relation of God to the Holy Spirit. For He is, as it were, a sweet savour of His Substance, working plainly on the senses, conveying to the creature an effluence from God, and instilling in him through Itself participation in the Sovereign Substance of the Universe. For if the fragrance of sweet herbs imparts some of its power to garments with which it comes in contact, and in some sort transforms its surroundings into likeness with itself, surely the Holy Ghost has power, since He [is by nature of God, to make those in whom He abides partakers in the Divine Nature through Himself. The Son then, being the Fruit and express Image of the Father's Person by nature, engrosses all that is His. And therefore He says, All things whatsoever the Father hath are Mine: therefore said I unto you, that He taketh of Mine and shall declare it unto you----the Spirit, that is, Who is through Him and in Him, by Whom He personally dwells in the Saints. For His Spirit is not distinct from Him, even though He may be conceived of as having a separate and independent existence: for the Spirit is Spirit, and not the Son.