On John 8.25-27
THE WORDS of our Lord Jesus Christ which he exchanged with the Jews, so controlling his language that the blind might not see and the believers might open their eyes, which were read aloud from the holy Gospel today are these: "Therefore the Jews said, 'Who are You?"' For the Lord had said before, "If you do not believe that I am, you will die in your sins." 1. To this, then, they [answered], "Who are You?", as if seeking to know in whom they ought to believe, that they might not die in their sin. He answered those who were asking, "Who are you?", and he said, "The beginning, because I also speak to you." 2.
(2) If the Lord said that he was the beginning, it can be asked whether the Father is also the beginning. For if the Son who has the Father is the beginning, how much more easily ought God the Father to be understood to be the beginning, who does indeed have the Son to whom he is the Father but has no one of whom he is? For the Son is the Son of the Father, and the Father is, of course, the Father of the Son; but the Son is called God of God, the Son is called Light of Light. The Father is called Light, but not of Light; the Father is called God, but not of God. If, therefore, God of God, Light of Light is the beginning, how much more easily is the Light of which he is Light and the God of whom he is God to be understood as the beginning? And so it seems ridiculous, my dearest people, that we should call the Son the beginning but should not call the Father the beginning.____________________