For he whom God has sent speaks the words of God: for God gives not the Spirit by measure unto him.
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Cyril of Alexandria
AD 444
The Father then knoweth that His own Son is in Him the Same by Nature (for this I suppose the words, are One, signify, and nothing else), and acknowledgeth Him as Son not creature; Son I mean of His own Essence, and not honoured with the bare name of Sonship. For He knows that He is the Exact Image of His own Proper Self, so that He is perfectly seen in Him, and depicts in Himself Him That by Nature Ineffably beamed forth from Him, and hath in Himself the Son, is again in the Son, by reason of Sameness of Essence.
These things, o heretic, by considering, thou shalt release thyself from bitter disease, and us from trouble in argument and controversy. For He Whom God hath sent speaketh the words of God. If these words be considered simply, what will there be of marvel in the Son? For was not every one of the holy Prophets also both sent from God, and did he not declare His words? And indeed it is somewhere said to the hierophant Moses, And now come, I will send thee into Egypt, and thou shalt say unto Pharaoh, Thus saith the Lord: to the most holy Jeremiah, Say not, I am a child: for thou shalt go to all that I shall send thee, and whatsoever I command thee thou shalt speak. What more then is there in the Son by Nature Who speaketh the words of God, because He is sent by Him? He will be declared to us again (it seems) as a Prophet, and nothing else, in respect of ministry. Therefore you will here understand hath sent, either in respect of the Incarnation and the Coming into this world with Flesh: or again you will take it in a more God-befitting and higher sense. For the Father hid not the Son in Himself, but He beamed forth of His Nature, as brightness from light, after the unspeakable and inexplicable mode of Divine Generation: which too the Only-Begotten was making known to us, in saying, I came forth from the Father, and am come. For the Son hath come forth from the Father into His Proper Being, even though He be in Him by Nature. And what I came forth there means, this again the being sent here signifies. The Word then (he says) That hath appeared and flashed forth from the Father, in that He is God of God, will use words befitting God: but the words befitting God are true words, and such as reject all stain of falsehood. He then that receiveth the testimony of the Saviour hath sealed that God is true; for He is indeed by Nature God.
For He giveth not the Spirit by measure. Promise now specially keen attention, my good friend, that with me you may wonder at the sober wisdom of the Saints. He said therefore that the Son was both sent of God, and speaketh the words of God. But he is observed as far as belongs to the simple force of the words to clothe Him with the prophetic measure, as we have just said. He: removes Him then in these words from equality with them, and through this one token gives us to understand, how great, yea, rather now how incomparable the difference. For it is impossible, saith he, that they who have received the Spirit by measure, could give It to another. For never hath saint to saint been the bestower of the Holy Ghost: but the Son giveth to all, as of His own fulness. He then giveth not by measure, nor hath He, as they, some little portion of the Spirit, and this by participation: but since He was shewn to be the Giver too of It, it is manifest I suppose that He hath It wholly Essentially in Himself. He then that hath so great superiority over them, will not speak the. things of God as one of them, but being God of God, will pour forth words befitting God.
But it will no how interfere with what has been said that certain deem that by Apostolic hands the Spirit was given to some: for we will believe them to be invokers of the Spirit, rather than truly givers of It: since the blessed Moses too was not enjoined himself to take of the Spirit that was on him but God kept this too in His Power alone, saying that he must put forth the seventy, and promising to take of the Spirit that was on him, and put it upon them. For He knew that it befits God Alone to perform things God-befitting.