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In seven witty, lucid, and tough-minded essays, C.S. Lewis considers questions that challenge the faith of modern Christians. He discusses the efficacy of prayer, the various uses of the phrase "I believe," and the meaning of words like "culture" and "religion," and the interplay of "good works." He examines the religious implications of life on other planets and the doctrine of the econd Coming. This collection is also notable for a Screwtape dialogue in which that "very experienced devil" makes a brilliant speech on the opportunities for exploiting the evil in the world, concluding, "Nowhere do we tempt so successfully as on the very steps of the alter."