Pre-sleep exercise: If he is trying to cure himself of a bad habit, for example, let him think of a situation which gives rise to it and then of the physical and mental miseries which result from it. Then he must picture to himself the development of such a situation and of his reaction to it in a positive reformed way. If this exercise is repeated night after night, he will one day find that when the situation occurs in real life, he will react rightly to it, resolutely turning his back on the bad habit. No special effort of will need be made; the change will be natural easy smooth and without strain. It will be as though some external force had intervened and resisted the bad habit on his behalf, achieving instantaneous triumph.
-- Notebooks Category 19: The Reign of Relativity > Chapter 3: The States of Consciousness > # 152