Which C.S. Lewis book collects his BBC talks on Christianity?

Mere Christianity collects C.S. Lewis’s BBC talks on Christianity.

Lewis delivered the original radio talks during the Second World War, beginning in 1941. The broadcasts were aimed at a general British audience and explained basic Christian ideas in accessible language rather than presenting a technical theological system. Lewis later revised and combined the material into book form.

The title refers to what Lewis called “mere Christianity”: the common beliefs shared across the major Christian traditions. The book is organized into four parts, including “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.”

Mere Christianity is sometimes confused with The Problem of Pain, another Lewis work of Christian apologetics. The latter addresses suffering and was published in 1940, before the BBC broadcasts. Mere Christianity’s distinctive origin is its development from wartime radio talks.