C. S. Lewis in The Problem of Pain
We are very shy nowadays of even mentioning Heaven. We are afraid of the jeer about "pie in the sky," and of being told that we are trying to "escape from the duty of making a happy world here and now into dreams of a happy world elsewhere." But either there is "pie in the sky" or there is not. If there is not, then Christianity is false, for this doctrine is woven into its whole fabric. If there is, then this truth, like any other, must be faced, whether it is useful at political meetings or no.