Then returning to the words of Peter, Godmade Him Lord and Christ, he skilfully explains it by many arguments, and herein shows Eunomius as an advocate of the orthodox doctrine, and concludes the book by showing that the Divine and Human names are applied, by reason of the commixture, to either Nature
These words are not mine: they are those of him who fights against the Word. For he says, in the very passage that is before us for examination, exactly thus:— “The blessed Peter speaks of Him Who was in the beginning and was God, and expounds to us that it was He Who became Lord and Christ.” Eunomius, then, says that He Who was whatsoever He was became Lord and Christ, as the history of David tells us that he, being the son of Jesse, and a keeper of the flocks, was anointed to be king: not that the anointing then made him to be a man, but that he, being what he was by his own nature, was transformed from an ordinary man to a king.
What follows? Is it thereby the more established that the essence of the Son was made, if, as Eunomius says, God made Him, when He was in the beginning and was God, both Lord and Christ? For Lordship is not a name of His being but of His being in authority, and the appellation of Christ indicates His kingdom, while the idea of His kingdom is one, and that of His Nature another. Suppose that Scripture does say that these things took place with regard to the Son of God.
Let us then consider which is the more pious and the more rational view. Which can we allowably say is made partaker of superiority by way of advancement— God or man? Who has so childish a mind as to suppose that the Divinity passes on to perfection by way of addition? But as to the Human Nature, such a supposition is not unreasonable, seeing that the words of the Gospel clearly ascribe to our Lord increase in respect of His Humanity: for it says, “Jesus increased in wisdom and stature and favour.”
Which, then, is the more reasonable suggestion to derive from the Apostle's words?— that He Who was God in the beginning became Lord by way of advancement, or that the lowliness of the Human Nature was raised to the height of majesty as a result of its communion with the Divine? For the prophet David also, speaking in the person of the Lord, says, “I am established as king by Him,” with a meaning very close to “I was made Christ:” and again, in the person of the Father to the Lord, he says, “Be Lord in the midst of Your enemies,” with the same meaning as Peter, “Be made Lord of Your enemies.”
As, then, the establishment of His kingdom does not signify the formation of His essence, but the advance to His dignity, and He Who bids Him “be Lord” does not command that which is non-existent to come into being at that particular time, but gives to Him Who is the rule over those who are disobedient—so also the blessed Peter, when he says that one has been made Christ (that is, king of all) adds the word “Him” to distinguish the idea both from the essence and from the attributes contemplated in connection with it.
For He made Him what has been declared when He already was that which He is. Now if it were allowable to assert of the transcendent Nature that it became anything by way of advancement, as a king from being an ordinary man, or lofty from being lowly, or Lord from being servant, it might be proper to apply Peter's words to the Only-begotten. But since the Divine Nature, whatever it is believed to be, always remains the same, being above all augmentation and incapable of diminution, we are absolutely compelled to refer his saying to the Humanity.
For God the Word is now, and always remains, that which He was in the beginning, always King, always Lord, always God and Most High, not having become any of these things by way of advancement, but being in virtue of His Nature all that He is declared to be, while on the other hand He Who was, by being assumed, elevated from Man to the Divinity, being one thing and becoming another, is strictly and truly said to have become Christ and Lord. For He made Him to be Lord from being a servant, to be King from being a subject, to be Christ from being in subordination.
He highly exalted that which was lowly, and gave to Him that had the Human Name that Name which is above every name. And thus came to pass that unspeakable mixture and conjunction of human littleness commingled with Divine greatness, whereby even those names which are great and Divine are properly applied to the Humanity, while on the other hand the Godhead is spoken of by human names. For it is the same Person who both has the Name which is above every name, and is worshipped by all creation in the human Name of Jesus. For he says, “at the name of Jesus every knee shall bow, of things in heaven and things in earth, and things under the earth, and every tongue shall confess that Jesus is Lord, to the glory of God the Father.” But enough of these matters.
Source: Against Eunomius (New Advent)