Which C.S. Lewis book records his argument that Christianity is “the truth”?

Mere Christianity records C.S. Lewis’s argument that Christianity is “the truth.”

The book developed from radio talks Lewis gave for the BBC during the Second World War. The talks were broadcast in three series between 1941 and 1944, and their material was later revised and collected under the title Mere Christianity. The book presents shared Christian beliefs rather than a detailed defense of one denomination.

Lewis organizes the work into four parts: “Right and Wrong as a Clue to the Meaning of the Universe,” “What Christians Believe,” “Christian Behaviour,” and “Beyond Personality.” His famous moral argument begins with the idea that people appeal to a standard of right and wrong even while breaking it.

The book is sometimes confused with The Problem of Pain, which addresses suffering, or with Miracles, which examines supernatural belief. Mere Christianity is specifically the title associated with Lewis’s wartime broadcast apologetics and their later book form.