What book collected C.S. Lewis’s wartime radio talks?

Mere Christianity collected C.S. Lewis’s wartime radio talks.

Lewis delivered a series of BBC radio broadcasts during the Second World War, beginning in 1941. The talks explained basic Christian ideas for a broad public audience and avoided presenting the distinctive doctrines of a single denomination.

The broadcasts were later revised and published in book form. The resulting work, Mere Christianity, became one of Lewis’s most widely read works of Christian apologetics. Its title refers to the shared core of belief that Lewis argued was common to historic Christianity.

The book is sometimes described as a transcript of the broadcasts, but it was edited and reorganized across several stages. The sections developed from the original talks include “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” and “Christian Behaviour.”