“It is much more sensible to be an optimist instead of a pessimist, for if one is doomed to disappointment, why experience it in advance?”

“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.”

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

“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.”

“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.”

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

“The man who is a pessimist before 48 knows too much; if he is an optimist after it he knows too little.”

“The optimist sees the donut, the pessimist sees the hole.”