Augustine of Hippo

(de Trin. i. 6.) But John declares the Son to be not only God, but even of the same substance as the Father; for when he had said, The Word was God, he added, all things were made by Him; whence it is clear that He was not made by Whom all things were made; and if not made, then not created; and therefore of one substance with the Father, for all that is not of one substance with the Father is creature.