C.S. Lewis’s BBC broadcast talks began in 1941 and later formed the basis of Mere Christianity. The talks were delivered during the Second World War for a British radio audience seeking moral and spiritual guidance.
Lewis presented arguments about human morality, belief, and Christian doctrine in plain, conversational language. The broadcasts were made in several series between 1941 and 1944. Their radio format helped make Lewis a widely recognized public religious speaker beyond the academic world of Oxford.
The talks were later revised and combined into the book Mere Christianity, first published in 1952. The book is not a transcript of a single uninterrupted lecture series; it gathers material from multiple broadcast sets and organizes it into a sustained introduction to central Christian beliefs.