6204. In addition to this it should be recognized that evil entering a person's thought does not do him harm; for spirits from hell are constantly pouring in evil, but angels are constantly driving it away. But when it enters the will it does do harm, for it leads on to actions as often as external restraints do not hinder it. Evil enters the will when it is retained in one's thought, is approved of, and especially when it is acted upon and therefore delighted in.