Which C.S. Lewis book presents material from his BBC radio talks?

Mere Christianity presents material developed from C.S. Lewis’s BBC radio talks.

Lewis delivered the talks during the Second World War, beginning in 1941. The broadcasts addressed basic Christian beliefs for a general audience rather than arguing for one denomination. Their conversational style helped make difficult theological ideas accessible to listeners across Britain.

Lewis later revised and combined the talks into book form. Mere Christianity was published in 1952, and its title refers to the core beliefs shared by historic Christian traditions. The book is organized around morality, Christian belief, and Christian conduct.

It is sometimes mistaken for a transcript of a single lecture series, but the published volume reflects editing and reworking. The book became one of Lewis’s most influential works of Christian apologetics, alongside The Problem of Pain and Miracles.