You are my witnesses,
says the LORD,
and my servant whom I have chosen: that you may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.
All Commentaries on Isaiah 43:10 Go To Isaiah 43
John Chrysostom
AD 407
Still I would like to ask of our opponents what the words mean that were once uttered by the prophet, “Before me there was no God, and after me there is none.” If the Son is younger than the Father, how can the Father say, “after me there shall be none”? You will not, therefore, also deprive the Only Begotten himself of his substance, will you? Indeed, you must dare to do this or else to accept the one Godhead with the distinct persons of the Father and the Son.