"Let him do anything but act. No amount of piety in his imagination and affections will harm us if we can keep it out of his will. As one of the humans has said, active habits are strengthened by repetition but passive ones are weakened. The more often he feels without acting, the less he will be able ever to act, and, in the long run, the less he will be able to feel."

-----C.S. Lewis, "The Screwtape Letters"