User blog comment:Brad Davenport/Angel creation/@comment-3045936-20141130153800

Theory. Angels are the original basses of the concept of the soul. EXCEPT, the grace is what makes them celestial beings. Just as Dean said when he was a demon, he had the Mark of Cain AND demon juice. So grace is angel juice. But, when they have no grace their spiritual self becomes human-like. But even Angels that turn human, can hear angel radio, and can absorb grace to become Angels again.