Here they dwell first on the expression, He will take of Mine. They say: of Mine means from Me, and will take means He proceeds. Secondly, they dwell on the words: All things that the Father has are Mine. They reason thus: if the Son has all that the Father has, and the Father, among other things, has the property that the Holy Spirit proceeds from Him, then the Holy Spirit proceeds also from the Son.
But such an interpretation and such reasoning are, first, entirely contrary to the structure of the discourse. According to that structure, the meaning of the Savior's words is plainly this: I have not yet taught you many truths, because you are now unable to understand them. But when the Spirit of truth comes, Whom I have promised you, He will fill this lack in My stead and will guide you into all truth.
He will fill it in My stead, for He will not teach some teaching of His own, new and different from Mine. He will not speak of Himself, but whatever He hears He will speak. On the contrary, He will continue the same teaching which I taught: He will take of Mine and declare it to you.
And since I said to you before that My teaching is not Mine, but His Who sent Me (Jn 7:16; cf. Jn 14:10 and elsewhere), I add, so that My present word may be clear to you, that all things that the Father has are Mine. Therefore I said: The Holy Spirit will take of Mine and declare it to you.
Consequently, the words He will take of Mine, and then all things that the Father has are Mine, refer exclusively to the teaching which the Son, as He Who came to earth to fulfill the Father's will for the salvation of men, received from the Father. The Holy Spirit, as the successor of the Son on earth in the same great work, was to receive it from the Son.
The expression He will take of Mine and declare it to you must not be understood as meaning: The Holy Spirit will borrow from Me what He formerly did not know and did not possess. The Spirit, being God, knows all and possesses all from eternity. It must be understood thus: After Me He will continue My own teaching, and not any other. He will remind you of all that I said to you (Jn 14:26), and in My stead He will complete what I would still have wished to say to you, but what you cannot understand now.
Why is this so? Because we are one with Him in essence. We have one and the same wisdom and knowledge, and one and the same indivisible operation. Thus the ancient teachers of the Church explained this.
Secondly, if some of them saw in the words He will take of Mine a thought about the eternal procession of the Holy Spirit, they understood it altogether differently from the way Western Christians now wish to understand it.
Christ said, He will take of Mine, that is, of My Father, writes Saint Athanasius the Great. For He added: All things that the Father has are Mine. Therefore I said that He will take of Mine and declare it to you.
Blessed Augustine expresses himself still more clearly: As for what Christ said about the Holy Spirit, He will take of Mine, He Himself resolves the question. Lest anyone think that the Spirit is from Him through certain degrees, as He Himself is from the Father, when both are from the Father, the one being born, the other proceeding: cum ambo de Patre, ille nascatur, iste procedat.
Therefore, I say, lest they think this, He immediately added: All things that the Father has are Mine. Therefore I said that He will take of Mine. Without doubt, He wished to be understood as saying that the Spirit proceeds from the Father.
The same explanation of the text was later accepted by Alcuin, or Albinus, famous in the West, and by other writers, both Western and Eastern.
Let us now descend to particulars. Thirdly, if the expression He will take of Mine means that He borrows eternal being from Me, that He proceeds from Me, then we must ask: why does the verb will take stand in the future tense, exactly as immediately before it He will glorify, and after it He will declare?
Did the Holy Spirit not yet proceed from the Son at the time when He was speaking with the Apostles, and was He only about to proceed after His Ascension into heaven? To assert that the verb will take expresses the past or the present is to assert that the two other verbs inseparably connected with it, He will glorify and He will declare, also express the past or present. But that would be a complete distortion of the meaning of the discourse.
If, without any basis, we allow that only the verb will take signifies the present, while the other two signify the future, then we shall see a new distortion of the meaning. The Savior's words would have to be understood thus: The Holy Spirit will glorify Me, because He proceeds from Me and will declare to you. But what, then, will He declare?
Fourthly, the reasoning of the dissenters leads to still greater incongruities, when they take without any limitation the Savior's words, All things that the Father has are Mine, and say: The Father has the property of bringing forth the Holy Spirit; therefore the Son has it also.
For in exactly the same way one could reason: The Father also has the property of being unbegotten; therefore the Son has it also. The Father also has the property of begetting the Son; therefore the Son has it also.
On the other hand, since the Son Himself said to the Father, All Mine are Yours (Jn 17:10), and the Son has the property of being begotten of the Father, must we conclude from this that the Father also has the same property? The Incarnation belongs to the Son. Does it therefore belong to the Father also?
The only means of removing all these incongruities is to take the Savior's words, All things that the Father has are Mine, with a limitation. The Son truly has all that the Father has according to essence and Godhead, just as the Father has all that the Son has, but with the exception of personal properties.
The ancient and renowned teachers of the Church understood the cited saying precisely in this way. They said that by this saying the unity of nature of the Father and the Son is properly indicated. Their essential properties are signified, and in general everything common between Them, but by no means Their special properties.
Therefore they reasoned that all that the Father has, not only the Son has, but the Holy Spirit also has. Consequently, they did not and could not have had the thought of deriving from these words of the Savior a conclusion about the eternal procession of the Holy Spirit, as is now done. Otherwise one would have to admit that the Fathers thought He proceeds also from Himself.
It should be noted that the proofs examined for the Western teaching about the personal property of the Holy Spirit, especially the last, are recognized by the dissenters as the chief ones. The others are considered less strong, and therefore deserve less attention. Thus they strive to infer the eternal procession of the Holy Spirit.