Which C.S. Lewis work was adapted from his 1941 BBC talks on Christianity?

Mere Christianity was adapted from C.S. Lewis’s 1941 BBC talks on Christianity.

The talks were broadcast during the Second World War as a series of short radio presentations intended for a broad public audience. Lewis was asked to explain and defend basic Christian beliefs in accessible language, and the broadcasts made him a familiar voice to British listeners.

The material was later revised and arranged into book form. Mere Christianity was published in 1952 and organized into four parts: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.” The title refers to the shared core of Christian belief rather than to one denomination.

The work is distinct from The Problem of Pain, which was published in 1940 and focuses primarily on suffering and the goodness of God. It is also different from Lewis’s earlier broadcast series, whose talks were later collected under the title Broadcast Talks.