But still for intellectual honour has sunk very low in our age I hear someone whimpering on with his question, ‘Will it help me? Will it make me happy’? Do you really think I’d be better if I became a Christian?’ Well, if you must have it, my answer is ‘Yes.’ But I don’t like giving an answer at all at this stage. Here is a door, behind which, according to some people, the secret of the universe is waiting for you. Either that’s true, or it isn’t. And if it isn’t, then what the door really conceals is simply the greatest fraud, the most colossal ‘sell’ on record. Isn’t it obviously the job of every man (that is a man and not a rabbit) to try to find out which, and then to devote his full energies either to serving this tremendous secret or to exposing and destroying this gigantic humbug? Faced with such an issue, can you really remain wholly absorbed in your own blessed ‘moral development’?
C.S. Lewis, “Man or Rabbit?” published as a pamphlet for the Student Christian Movement in Schools (probably 1946) and God in the Dock (Eerdmans: 1970) 111-112.