“A pessimist is a man who has been compelled to live with an optimist.”

“A pessimist is a man who thinks all women are bad. An optimist is one who hopes they are. ”

“A pessimist is a person who has had to listen to too many optimists.”

“Optimists and pessimists die the same way. They just live differently. I prefer to live as an optimist.”

“To the optimist, pessimists are neurotic; to the pessimist, optimists are deluded.”

“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.”

“Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.”

“Between the optimist and the pessimist, the difference is droll. The optimist sees the doughnut; the pessimist the hole! ”

“Both optimists and pessimists contribute to our society. The optimist invents the airplane and the pessimist the parachute.”

“[…] You see, you are an optimist and live on hope. I am a pessimist and live on experience.”