Clayton Christensen, influential business/management thinker, wrote "How Will You Measure Your Life?", and on purpose & faith. (w/ links to his business work)

• Book: How Will You Measure Your Life? (various sources)
• My Beliefs (by Clayton Christensen)
  

  "As I have progressed through my life, my commitment to the Church of
  Jesus Christ of Latter-day Saints has deepened for two reasons. ...
  "

• Why I Believe (by Clayton Christensen)
  

  "I had read the Book of Mormon before -- seven times, to be exact. But in
  each of those instances I had read it by assignment -- from my parents
  or a teacher -- and my objective in reading it was to finish the book.
  This time, however, my objective was to find out if it was a true book
  or a fabrication. Accordingly, I reserved the time from 11:00 until
  midnight, every night, to read the Book of Mormon next to the fireplace
  in my chilly room at the Queen's College. I began each of those sessions
  by kneeling in verbal prayer. I told God, every night, that I was
  reading this to know if it was His truth. I told Him that I needed an
  answer to this question -- because if it was not true I did not want to
  waste my time with this church and would search for something else. But
  if it was true, then I promised that I would devote my life to following
  its teachings, and to helping others do the same.
  "