Wittgenstein is primarily known for his work on philosophy of logic, language and mind, but he was a cult figure at Cambridge when he taught there in the first half of the 20th century.

Part of this, I think, has to do with his eccentric but enduringly fascinating views on ethics and religion. In this book, the late Norman Malcolm, a protege of Wittgenstein's, examines a curioius remark Wittgenstein makes to his friend Maurice O'Drury--along the lines of 'seeing every problem from a religious point of view'. It's curious because W. was not religious in the traditional sense. Yet he was a deep thinker, passionate about his own attitude toward life. He was, in a sense, a grippingly spiritual man, and Malcolm's book is a worthwhile attempt to understand Wittgenstein's religious attitude toward life.

I recommend it for those interested in Wittgenstein, religion or spirituality.