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
How well he remembers the task before him! How much to the point is the conclusion of his argument! Basil declares that the Apostle said that the man who was “seen” was made Christ and Lord, and this clear and quick-witted over-turner of his statements says, “If Peter does not say that the essence of Him Who was in the beginning was made, the man who was 'seen' 'emptied himself' to take the 'form of a servant,' and He Who 'emptied Himself' to take the 'form of a servant, emptied Himself to become man.”
We are conquered, Eunomius, by this invincible wisdom! The fact that the Apostle's discourse refers to Him Who was “crucified through weakness” is forsooth powerfully disproved when we learn that if we believe this to be so, the man who was “seen” again becomes another, “emptying Himself” for another coming into being of man. Will you never cease jesting against what should be secure from such attempts? will you not blush at destroying by such ridiculous sophisms the awe that hedges the Divine mysteries? will you not turn now, if never before, to know that the Only-begotten God, Who is in the bosom of the Father, being Word, and King, and Lord, and all that is exalted in word and thought, needs not to become anything that is good, seeing that He is Himself the fullness of all good things?
What then is that, by changing into which He becomes what He was not before? Well, as He Who knew not sin becomes sin, that He may take away the sin of the world, so on the other hand the flesh which received the Lord becomes Christ and Lord, being transformed by the commixture into that which it was not by nature: whereby we learn that neither would God have been manifested in the flesh, had not the Word been made flesh, nor would the human flesh that compassed Him about have been transformed to what is Divine, had not that which was apparent to the senses become Christ and Lord.
But they treat the simplicity of what we preach with contempt, who use their syllogisms to trample on the being of God, and desire to show that He Who by creation brought into being all things that are, is Himself a part of creation, and wrest, to assist them in such an effort to establish their blasphemy, the words of Peter, who said to the Jews, “Be it known to all the house of Israel that God made Him Lord and Christ, this Jesus Whom you crucified.” This is the proof they present for the statement that the essence of the Only-begotten God is created!
What? Tell me, were the Jews, to whom the words were spoken, in existence before the ages? Was the Cross before the world? Was Pilate before all creation? Was Jesus in existence first, and after that the Word? Was the flesh more ancient than the Godhead? Did Gabriel bring glad tidings to Mary before the world was? Did not the Man that was in Christ take beginning by way of birth in the days of Cæsar Augustus, while the Word that was God in the beginning is our King, as the prophet testifies, before all ages?
See you not what confusion you bring upon the matter, turning, as the phrase goes, things upside down? It was the fiftieth day after the Passion, when Peter preached his sermon to the Jews and said, “Him Whom you crucified, God made Christ and Lord.” Do you not mark the order of his saying? Which stands first, which second in his words? He did not say, “Him Whom God made Lord, you crucified,” but, “Whom you crucified, Him God made Christ and Lord”: so that it is clear from this that Peter is speaking, not of what was before the ages, but of what was after the dispensation.
Source: Against Eunomius (New Advent)