For more than 25 years, Armand Nicholi has taught a course at Harvard that compares the philosophical arguments of Sigmund Freud and C.S. Lewis. These men never met, and so Nicholi presents the writings and letters of Lewis and Freud, allowing them to "speak" for themselves on the subject of belief and atheism. Both also considered the problem of pain and suffering as well as the nature of love and sex, and Nicholi suggests in this intriguing study—inspiration for a 2004 PBS series—that each of them thought carefully about the alternatives to their positions.