What is the title of C.S. Lewis’s book of radio talks later revised as Mere Christianity?

C.S. Lewis’s radio talks were first published in book form as Broadcast Talks. The talks were delivered for the BBC during the Second World War, beginning in 1941, and were later revised and combined with related material under the title Mere Christianity.

Lewis aimed to present basic Christian beliefs in accessible language rather than argue for one particular denomination. The broadcasts reached a wide audience in wartime Britain, and their conversational style helped establish Lewis as a prominent public Christian thinker.

The final Mere Christianity volume is arranged in four books: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.” Broadcast Talks is therefore an earlier publication title, not the name of a separate unrelated argument. The material’s publication history explains why different editions can have different titles and arrangements.