C.S. Lewis’s 1941 radio broadcasts were titled Broadcast Talks.
The BBC began airing the talks during the Second World War, with the first series broadcast in 1941. Lewis spoke directly to listeners about basic Christian belief, aiming to explain common ground rather than defend one particular denomination.
The talks were later revised and expanded into books. The first series became The Case for Christianity, the second became Christian Behaviour, and the third became Beyond Personality. These three works were subsequently collected as Mere Christianity, first published in book form in 1952.
The title Mere Christianity therefore belongs to the later book, not to the original 1941 broadcast series. Lewis’s calm, conversational delivery helped make the broadcasts widely known in Britain. Their radio origins also explain why the arguments are organized in short, accessible sections rather than as one continuous academic treatise.