9 But now let us continue our reading of this Scripture, to show how the consistency of truth is unaffected by these dishonest objections. The next words are, And God made man; after the image of God made He him. The image is in common; God made man after the image of God. I would ask him who denies that God's Son is true God, in what God's image he supposes that God made man? He must bear constantly in mind that all things are through the Son; heretical ingenuity must not, for its own purposes, twist this passage into action on the part of the Father. If, therefore, man is created through God the Son after the image of God the Father, he is created also after the image of the Son; for all admit that the words After Our image and likeness were spoken to the Son. Thus His true Godhead is as explicitly asserted by the Divine words as manifested in the Divine action; so that it is God Who moulds man into the image of God, Who reveals Himself as God, and, moreover, as true God. For His joint possession of the Divine image proves Him true God, while His creative action displays Him as God the Son.
Source: On the Trinity (New Advent)