“To the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hoping are optimistic.”

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

“I am by nature an optimist and by intellectual conviction a pessimist.”

“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.”

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

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

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

“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.”