Arius began teaching that the Son was a created being, and not truly God. He did so because he believed that God is the origin and cause of everything, but is not caused to exist by anything else. “Uncaused” or “Unoriginate,” he therefore held, was the best basic definition of what God is like. But since the Son, being a son, must have received his being from the Father, he could not, by Arius’s definition, be God.
