“Pessimistic" is a word for "realistic" that optimists use to make themselves feel better (about their unrealisticness).”
“The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.”
“The difference between an optimist and a pessimist? An optimist laughs to forget but a pessimist forgets to laugh.”
“Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.”
“In the long run, the pessimist may be proved right, but the optimist has a better time on the trip.”
“Still, Fritz was an optimist, and Karl was a pessimist, and that makes all the difference in the world.”