Imagination grows by exercise.
A writer need not devour a whole sheep in order to know what mutton tastes like, but he must at least eat a chop. Unless he gets his facts right, his imagination will lead him into all kinds of nonsense, and the facts he is most likely to get right are the facts of his own experience.
Yet magic is no more than the art of employing consciously invisible means to produce visible effects. Will, love and imagination are magic powers that everyone possesses; and whoever knows how to develop them to their fullest extent is a magician. Magic has but one dogma, namely, that the seen is the measure of the unseen.
