Pursue joy, not happiness. This is probably the hardest lesson of all to learn. It probably seems to you that the goal in life is to be happy. Oh, you maybe have to sacrifice and study and work hard, but, by and large, happiness should be predictable.

Reality Check: The Irreverent Guide to Outsmarting, Outmanaging, and Outmarketing Your Competition (ed. Penguin, 2008) - ISBN: 9781440634536