“In the long run, the pessimist may be proved right, but the optimist has a better time on the trip.”
“I'd rather be an optimist and a fool than a pessimist and right.”
“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.”
“Pessimists are usually right and optimists are usually wrong but all the great changes have been accomplished by optimists.”
“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.”