Materialism is in fact no protection. Those who seek it in that hope (they are not a negligible class) will be disappointed. The thing you fear is impossible. Well and good. Can you therefore cease to fear it? Not here and now. And what then? If you must see ghosts, it is better not to disbelieve in them.

That Hideous Strength (ed. Simon and Schuster, 1996) - ISBN: 9780684833675