Related:

• The pessimist complains about the wind; The optimist expects it to change
  The realist adjusts the sails. -- William Arthur Ward...
• If a pessimist is always right, is he a realist?
• Pessimist: An optimist with experience...
• 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...
• 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....
• An optimist is a man who looks forward to marriage. A pessimist is a married optimist.
• An optimist laughs to forget... a pessimist forgets to la