Which C.S. Lewis book collects his 1940s BBC talks on basic Christian beliefs?

Mere Christianity collects C.S. Lewis’s BBC talks on basic Christian beliefs.

Lewis delivered the original radio broadcasts during World War II, beginning in 1941. The talks were designed for a broad British audience and explained shared Christian ideas without focusing on the distinctive doctrines of one denomination. Their accessible style helped make Lewis a prominent public religious voice.

The broadcasts were later revised and published in stages as Broadcast Talks, Christian Behaviour, and Beyond Personality. These sections were eventually combined as Mere Christianity, a title referring to the common core of Christian belief rather than to a new church or denomination.

The book includes Lewis’s discussion of morality, human nature, repentance, and Christian virtues. It is not a direct transcript of every broadcast: Lewis edited and reorganized the material for publication. The work remains one of his best-known apologetic books.