What was the title of C.S. Lewis’s 1952 book based on wartime radio talks?

Mere Christianity was C.S. Lewis’s 1952 book based on wartime radio talks.

The talks were broadcast by the BBC during the Second World War, beginning in 1941. Lewis aimed to explain central Christian beliefs in accessible language, without focusing on differences among major Christian denominations. The original broadcasts were later revised and published in book form.

The title comes from Lewis’s use of “mere Christianity” to mean the common ground shared by historic Christian traditions. It does not mean a minimal or careless version of Christianity; rather, it refers to the core beliefs that Lewis believed united Christians.

The book is arranged in four main parts: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.” Its conversational style helped make it one of Lewis’s most widely read theological works.