"Mere Christianity" is the most popular of C.S. Lewis's works of non fiction, with several million copies sold world-wide.Heard first as radio addresses and then published as three separate books - "The Case for Christianity", "Christian Behavior" and "Beyond Personality" - this book brings together Lewis's legendary broadcast talks of the war years, talks in which he set out simply to 'explain and defend the belief that has been common to nearly all Christians at all times'.