The Propeth, has influenced me much but second only to Mahabharat, the timeless Epic.
While, Khalil Gibran, provides me wisdom on various aspects of day to day activities, emotions as well as relationship, Mahabharat also does the same, however, unlike Mahabharat, which has stories woven within stories, The Propeth, offers it on the platter.
English wise, difficult to read, but once some one reads it, many times, he or she will be bound to refer it in times of emotional distress.