Which C.S. Lewis book presents a series of Christian radio talks first broadcast in 1941–1944?

Mere Christianity presents C.S. Lewis’s Christian radio talks first broadcast from 1941 to 1944.

The talks were delivered for the BBC during the Second World War and were intended for a broad audience rather than only specialists. Lewis discussed morality, belief, Christian doctrine, and the meaning of conversion in a direct conversational style.

The broadcasts were later revised and published in book form. The title refers to what Lewis regarded as common or central Christianity shared across major Christian traditions, rather than to one denomination. The book is divided into four parts: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behavior,” and “Beyond Personality.”

Mere Christianity is often confused with The Problem of Pain, another important apologetic work by Lewis. The earlier book focuses especially on the problem of suffering, while Mere Christianity grew out of wartime broadcasts.