Mere Christianity presents C.S. Lewis’s explanation of Christianity through talks first broadcast during World War II. The talks were delivered for BBC radio and later revised into the book published in 1952.
The original broadcasts began in 1941, when Lewis was invited to speak about Christian belief to a country living through wartime uncertainty. Rather than focusing on one denomination, he tried to explain ideas shared across much of historic Christianity. This approach gave the work its title: “mere” means basic or common Christianity, not something trivial.
The book is arranged in four parts: Right and Wrong as a Clue to the Meaning of the Universe, What Christians Believe, Christian Behaviour, and Beyond Personality. Lewis uses illustrations and everyday arguments to discuss morality, doctrine, virtue, and the Trinity.
Mere Christianity is sometimes confused with The Problem of Pain, another major apologetic work. The latter concentrates on suffering, while Mere Christianity grew directly from wartime radio talks.