There are two equal and opposite errors into which our race can fall about the devils. One is to disbelieve in their existence. The other is to believe, and to feel an excessive and unhealthy interest in them. They themselves are equally pleased by both errors, and hail a materialist and a magician with the same delight.   — C.S. Lewis.  The Screwtape Letters.  New York: Time Incorporated, 1961, p. xxxi.