But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, who proceeds from the Father, he shall testify of me:
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Cyril of Alexandria
AD 444
When He says that both He Himself and His Father were hated by the perverse Jews, this hatred of theirs being gratuitous and without justification, He with good reason makes mention of the Spirit. He thus at once adds to the Word the completion of the Holy Trinity, and also shows that it was dishonoured, to the intent that the spectators of His miracles, who were guilty of insult against the Son, might also be convicted of treating with contumely the power which so far excels every substance, not only by refusing to accept Christ, even though He had worked great marvels to convince them, but also by their actions against Him. For they treated Him with an impiety which is shocking even to think of; and yet one might say, O senseless Jew, Christ was a worker of wonders before you far exceeding the glory of Moses and the glory of every Saint. For the saying of the Lord, If I had not done among them the works which none other did, brings back a thought before our minds. While then you crown with honours so illustrious Moses, the servant and minister of lesser things than these, you do not blush when you so perversely reject Him Who is immeasurably superior and a worker of far nobler deeds; even though He brought to their long foretold fulfilment the oracles given by Moses, and terminated the shadow by the truth. Our Lord Jesus Christ therefore of necessity joined the mention of the Spirit to that of Himself and the Father. And He also shows what has been said to be true; that is, that if any one chooses to hate the Son, he will also utterly contemn the Father from Whom He proceeds. And how, or in what way, consider further.
For observe, when calling the Comforter "the Spirit of truth," that is, His own, He says that He comes from the Father. For as the Spirit naturally belongs to the Son, being in Him and proceeding through Him, so also He belongs to the Father. But the qualities of Their Substance cannot be distinct, where the Spirit is common to both. Let not then any of those who are accustomed impiously to employ the language of folly lead us to the perverted opinion that the Son, executing as it were a kind of ministerial service, vouchsafes the Spirit that is received from the Father to the creature. For some have not scrupled perversely to say this. But it is more consistent to believe that since the Spirit belongs to Him, as He also certainly belongs to God the Father, He sends Him to His holy disciples to sanctify them. For if they think that in making the Son in this also a minister and servant to us, they form and utter a shrewd conception, surely it follows that we say to them: Ye fools and blind; do you not perceive that you are going back, and diminishing the glory of the Only-begotten, when you string together miserable sophistries from the ignorance that is in you? For if the Son ministers the Spirit from the Father, being ranked as a servant, surely it is necessary to admit that the Spirit is utterly different in Essence from Him, and perhaps His superior and far above Him, if the case be as you in your ignorance suppose. For if the Son does not proceed from the Father, that is, from His Essence, as you think, surely the Spirit when compared with the Son would be regarded as superior to Him. What then say we, when we hear Christ himself saying of the Spirit: He shall glorify Me; for He shall take of Mine and shall declare it unto you?
Now, besides what has been mentioned, this also will necessarily follow. For if you consider that the Son performs a ministerial service, providing us with That which is of another Nature, that is, the Spirit proceeding from God the Father Which is naturally holy, the Son is not by Nature holy, but only by participation, as we are. For by the ignorance of the impious He is declared to be different in Substance from the Father, from Whom also the Spirit provided unto us by Him proceeds. It will then be possible, since the Spirit does not belong to the Son, but He Himself is sanctified by adoption, as is the case with the creature, that He may fall away from the holiness that is in Him. For that which has been acquired as an addition might surely be removed, at the pleasure of Him Who has bestowed it. Who then will not flee away from such doctrines as these? I think, however, that our statement is more conformable to the truth.
The truth then is dear to us, as are the dogmas, expressing the truth; and we will not follow those heretics, but, pursuing the faith handed down by the holy fathers, we declare that the Comforter, that is, the Holy Spirit, belongs to the Son, and is not introduced from outside nor acquired in His case, as He is in that of those who receive sanctification, in whom though not originally innate He is implanted; but that the Son is of one Substance with the Spirit, as also He is with the Father. For if we take this view, the power of the doctrines of the Church will not be reduced in our case to a polytheistic mythology, but the Holy Trinity is united in the doctrine of a Single Divinity. Showing then that there is a Unity of Substance, I mean that of Himself and God the Father, in the same Being, in saying that the Comforter is the Spirit of truth He declares that He proceeds from the Father, and makes plain and beyond contradiction that the opposer of Christ is wholly at enmity with God. For he who in any degree allows himself to contemn the Son may be reasonably considered to transgress against Him from Whom He proceeds.
When then, He says, the Comforter, the Spirit of truth, that is My Spirit, Which proceeds from the Father, is come, He will testify of Me. And how will He testify? By working marvels in you, and by you He will be a just and true witness of My Godlike authority, and of the greatness of My power. For He that works in you is My Spirit, and as He is My Spirit, so also is He That of God the Father. Therefore it is necessary to consider that they who, to confirm our faith, work marvels in us by the one good Spirit are alike insulted in the Person of Christ, in Whom dwelt, as Paul says, no mere part of the ineffable Divine Nature, but all the fulness [of the Godhead] bodily.
But when the Spirit bears witness, you yourselves also, He says, will bear witness with Him. For you have been eye-witnesses and spectators of what I have done among My own, being even with Me as My disciples.
