“Optimists and pessimists die the same way. They just live differently. I prefer to live as an optimist.”
As quoted in Serving "60 Years to Life", Newsweek Europe (12 December 2005)
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Shimon Peres 15
Israeli politician, 8th prime minister and 9th president of… 1923–2016Related quotes
“[…] You see, you are an optimist and live on hope. I am a pessimist and live on experience.”
Page 352-353.
Stepping Westward (1965)

“A pessimist is a man who has been compelled to live with an optimist.”
The Note Book of Elbert Hubbard (1927)

“To the optimist, pessimists are neurotic; to the pessimist, optimists are deluded.”
Humor in Psychotherapy (2007)

“Optimists and pessimists differ only on the date of the end of the world.”
p, 125
Unkempt Thoughts (1957)

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

This is actually James Branch Cabell from The Silver Stallion (1926)
Misattributed

Epilogue, p. 242
Out of My Life and Thought : An Autobiography (1933)
Quoted in Women Know Everything!: 3,241 Quips, Quotes, and Brilliant Remarks By Karen Weekes, p. 41