Augustine of Hippo

The life of the soul is changeable. And when the soul lives in unrighteousness, that is its death; when again it becomes righteous, it becomes partaker of another life, which is not what itself is, inasmuch as by rising up to God, and cleaving to God, of Him it is justified. For it is said, "To him that believeth on Him that justifieth the ungodly, his faith is counted for righteousness." By forsaking God, it becomes unrighteous; by coming to Him, it is made righteous.