“Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.”
“The difference between an optimist and a pessimist? An optimist laughs to forget but a pessimist forgets to laugh.”
“The the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hope are optimistic.”
“The optimist and the pessimist both die in the end, but each lives is life in a completely different way.”
“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.”
“I tried to think about other things. I tried to invent optimistic inventions. But the pessimistic ones were extremely loud.”