Which C.S. Lewis book collects radio talks later broadcast as Mere Christianity?

Mere Christianity collects and revises C.S. Lewis’s wartime radio talks about basic Christian belief. The talks were broadcast by the BBC between 1941 and 1944, and the book was assembled in stages, with the familiar single-volume edition appearing in 1952.

Lewis was invited to speak during a period when Britain faced war and widespread uncertainty. His broadcasts avoided denominational disputes and instead argued from shared Christian ideas such as morality, repentance and the person of Jesus. The title means “mere” in the older sense of fundamental or common, not inferior.

The book is often mistaken for a transcript of one uninterrupted radio series. In fact, separate broadcast groups were edited into sections titled “Right and Wrong,” “What Christians Believe” and “Christian Behaviour.” That structure helped make the work one of Lewis’s most widely read apologetic books.