Which C.S. Lewis work developed from his BBC wartime broadcasts?

Mere Christianity developed from C.S. Lewis’s BBC wartime broadcasts.

Lewis gave a series of radio talks for the BBC during the Second World War. The talks were later revised and collected into the book Mere Christianity, first published in book form in 1952. The work presents what Lewis regarded as shared Christian beliefs rather than a detailed defense of one denomination.

Its chapters discuss morality, human nature, Christian belief, and the figure of Christ. The broadcasts made Lewis widely known to British listeners and helped establish him as a public Christian writer.

The title can be confused with Broadcast Talks, the early printed collection of the radio material, or with later expanded editions. Mere Christianity is the enduring book title associated with the complete revised presentation.