“The world belongs to optimists. Pessimists are only spectators.”
“Sometimes a pessimist is only an optimist with extra information.”
“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.”
“The optimist thinks this is the best of all possible worlds. The pessimist fears it is true. ”
“Still, Fritz was an optimist, and Karl was a pessimist, and that makes all the difference in the world.”