Which 1941 radio talks by C.S. Lewis were later revised as Mere Christianity?

C.S. Lewis’s 1941 radio talks were called Broadcast Talks.

Lewis delivered a series of short talks for the BBC during the Second World War. The broadcasts were intended for a general audience and explained basic Christian ideas without depending on a particular denomination. Lewis’s clear, conversational style made the talks widely noticed.

The talks were later revised and expanded into books. The first collection appeared as Broadcast Talks in 1942, followed by Christian Behaviour in 1943 and Beyond Personality in 1944. These three parts were eventually brought together as Mere Christianity in 1952.

The title Mere Christianity therefore belongs to the later collected work, not to the original broadcast series. The phrase refers to the central beliefs shared by historic Christian traditions. Lewis’s broadcasts helped establish him as one of the best-known Christian public intellectuals in Britain during the war.