“A pessimist is a person who has had to listen to too many optimists.”
“The man who is a pessimist before 48 knows too much; if he is an optimist after it he knows too little.”
“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.”
“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.”
“A pessimist is a man who thinks all women are bad. An optimist is a man who hopes they are.”