What book title was given to C.S. Lewis’s BBC talks on Christianity during World War II?

C.S. Lewis’s BBC talks on Christianity were published under the title Mere Christianity.

Lewis delivered the original radio talks between 1941 and 1944, during World War II. They were aimed at a broad audience rather than an academic one, explaining basic Christian beliefs in accessible language. The broadcasts were later revised and collected in book form as Mere Christianity.

The book is arranged in three major sections: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” and “Christian Behaviour.” Lewis presents arguments about morality, belief, and Christian practice while avoiding detailed treatment of denominational differences.

The title is often mistaken for one of Lewis’s other apologetic books, such as The Problem of Pain or Miracles. Mere Christianity specifically grew from the wartime radio broadcasts and became one of his most influential nonfiction works.