Which BBC broadcast-talks collection by C.S. Lewis was published as Mere Christianity?

C.S. Lewis’s BBC broadcast talks were collected and published as Mere Christianity.

Lewis delivered the talks during the Second World War, beginning in 1941. He aimed to explain shared Christian beliefs in language accessible to a broad radio audience rather than present a detailed defense of one denomination. The talks were later revised and collected into book form.

Mere Christianity is organized around themes including morality, Christian belief, and the doctrine of the Trinity. Its title refers to what Lewis regarded as common ground among the major Christian traditions.

The book is sometimes confused with The Problem of Pain or Miracles, which are separate works of Christian apologetics. Mere Christianity grew directly from radio talks, making it especially important in the history of religious broadcasting as well as in Lewis’s writing career.