Related:

• Don't ever become a pessimist, Ira; a pessimist is correct oftener than an optimist, but an optimist has more fun -- and neither can stop the march of events.
  -- Robert Heinlein, Time Enough For Love...
• A pessimist is a man who has been compelled to live with an optimist. -- Elbert Hubbard
• A pessimist is one who has been intimately acquainted with an optimist. -- Elbert Hubbard
• Pessimist: An optimist with experience...
• An optimist invented an airplane; a pessimist a parachute
• Twixt the optimist and pessimist The difference is droll
  The optimist sees the doughnut But the pessimist sees the hole....
• In the long run the pessimist may be right, but the optimist has a better time on the trip.
  -- Daniel L. Reardo...
• An optimist is a man who looks forward to marriage. A pessimist is a married optimist.