" The sin, both of men and of angels, was rendered possible by the fact that God gave them free will: thus surrendering a portion of His omnipotence (it is again a deathlike or descending movement) because He saw that from a world of free creatures, even though they fell, He could work out (and this is the reascent) a deeper happiness and a fuller splendour than any world of automata would admit. —from Miracles "
― C.S. Lewis , The C.S. Lewis Bible