Some other references

• The book by Viktor Frankl "Man's Search for Meaning" (many recommend it)
• Clayton Christensen, influential business/management thinker, wrote "How Will You Measure Your Life?", and on purpose & faith. (w/ links to his business work)
• The film "Man's Search for Happiness" (search for it on youtube or at churchofjesuschrist.org -- no "the" in the URL)
• "Why I'm Still Here" [a member of the Church of Jesus Christ of Latter-day Saints explains why they stay, despite other things being popular at times]
  

  "My faith in Jesus Christ and His prophets has contributed to the goodness of
  my life: my education, my children, my marriage, my love of neighbors. If I am
  at peace with my life, it is because I am committed to the Savior, His gospel,
  and His Church. 
  
  So why am I here? 
  
  The answer, in verse, came first from Peter.  In John 6 we read that other 
  disciples were leaving the faith, so Jesus put the question to 
  Peter: 'Will ye also go away?'
   
  Peter's response: 'Lord, to whom shall we go? We believe and are sure that 
  thou art that Christ, the Son of the living God (John 6:67-69).' 
  
  Simply stated, I am sure that Jesus is the Christ, the Son of the living 
  God. I believe that this is His Church. And I rejoice to belong here.
  "

• ...and very much similar material if you look.