Having said that he was a Atheist, I hasten to add that he was a "Rationalist" of the old, high and dry nineteenth-century type. For Atheism has come down in since those days, and mixed itself with politics and learned to dabble in dirt. The anonymous donor who now sends me anti-God magazines hopes, no doubt, to hurt the Christian in me; he really hurts the ex-Atheist. I am ashamed that my old mates and (which matters much more) Kirk's old mates would have sunk to what they are now. It was different then; even McCabe wrote like a man. At the time when I know him, the fuel of Kirk's atheism was chiefly of the anthropological and pessimistic kind. He was great on The Golden Bough and Schopenhauer.
-C. S. Lewis, Surprised by Joy.