What title was given to C.S. Lewis’s BBC radio talks from 1941–1944?

C.S. Lewis’s BBC radio talks from 1941–1944 were published under the title Mere Christianity.

Lewis began broadcasting Christian talks for the BBC during the Second World War. The talks were later revised and gathered into books, including The Case for Christianity, Christian Behaviour, and Beyond Personality. These parts were eventually combined as Mere Christianity, first published as a single volume in 1952.

The book presents what Lewis called the common or central beliefs shared by most Christian traditions. It is especially known for the moral argument often summarized through the idea of a universal “Law of Nature,” as well as for discussions of Christian doctrine and virtue. The title refers to basic Christianity rather than to a particular denomination.