Theodoret of Cyrus — on Isa 43:11 (COMMENTARY ON ISAIAH 13:43.10-11)

“If you want to have me as a witness to your verdict, then be the first to render witness to my truth. In this case, I will not be alone in bearing witness, but there is also my chosen servant. Now it is neither Moses nor another of the prophets who is referred to here, but Christ our Master. And he calls him a [servant], not as God but as a human being; for it is as a human being that he has named him "chosen." … We likewise find in the holy Gospels this number of two witnesses. In the course of a conversation with the Jews our Master Christ in effect declared, "It is written in your law that the testimony of two persons is true. I bear witness concerning myself, and the Father who sent me bears witness." … "I am, I am your God, and there is no other savior besides me." Again these words proclaim the one divinity. For our Master Christ is called "savior" throughout the holy Scriptures, as I think even the followers of Arius and Eunomius would concede. Now if apart from God there is no savior and if Christ is called "Savior," it is clear that he participates in the [divine] nature. If Christ does not, as the blasphemers allege, then he is not Savior.… But if he is Savior, then he shares the same essence to which alone belongs the faculty of saving.”