The Last Conjuration
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 or unhealthy interest in them. They themselves are equally pleased by both errors and hail a materialist or a magician with the same delight. . . .
We are really faced with a cruel dilemma. When the humans disbelieve in our existence we lose all the pleasing results of direct terrorism and we make no magicians. On the other hand, when they believe in us, we cannot make them materialists and skeptics. At least not yet. . . . If once we can produce our perfect work—the Materialist Magician, the man, not using, but veritably worshipping, what he vaguely calls “Forces” while denying the existence of “spirits”—then the end of the war will be in sight.
—C. S. Lewis, The Screwtape Letters