What 1952 book collected C.S. Lewis's wartime BBC talks about Christianity?

Mere Christianity collected C.S. Lewis's wartime BBC talks about Christianity.

Lewis gave the original radio talks between 1941 and 1944, during the Second World War. They were intended to explain central Christian beliefs in accessible language to a broad British audience. Lewis later revised and gathered the material into book form, with Mere Christianity published in 1952.

The book is arranged in four parts: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.” Its argument moves from moral experience toward Christian doctrines and practical ethical questions.

Mere Christianity does not present a detailed account of one denomination's distinctive teachings. The phrase refers to the shared core of historic Christian belief. Readers sometimes assume the book was written directly as a single manuscript in 1952, but its foundation was the earlier broadcast series, which made Lewis a familiar public voice during wartime Britain.