Which C.S. Lewis book presents Christianity through radio talks adapted for print?

Mere Christianity presents C.S. Lewis’s explanation of core Christian beliefs, adapted from radio talks he delivered during the Second World War. The talks were broadcast by the BBC between 1941 and 1944 and later revised into book form.

Lewis did not originally deliver the material as a single finished book. The broadcasts addressed a broad British audience, including listeners affected by wartime uncertainty. Their aim was to explain what Lewis called “mere Christianity,” meaning beliefs shared across many historic Christian traditions.

The printed work is organized into four books: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.” The final form appeared in 1952.

The Problem of Pain is also a Lewis book about Christian belief, but it began as a separate 1940 publication. Mere Christianity is the title specifically associated with the wartime broadcast series.