I recently asked the almost 900 members of the "Catholic Professionals" group on Linkedin to identify the books that had most influenced their spiritual life. The following graph reflects "Screwtape Letters" by C.S. Lewis as the clear winner with 38% of those who responded naming it as their top pick. Though the bible was mentioned in several responses, I excluded it because I don't believe that most would naturally include the bible as a "book" in the same sense as say "The Imitation of Christ." I also excluded a long list of books that recieved only one mention each. Here's how it looks.