“The Optimist thinks this is the best of all possible worlds, the Pessimist fears it is true.”

— Robert Oppenheimer

This is derived from a statement of James Branch Cabell, in The Silver Stallion (1926) : The optimist proclaims that we live in the best of all possible worlds; and the pessimist fears this is true.
Misattributed
Variant: The optimist thinks this is the best of all possible worlds. The pessimist fears it is true.

Adopted from Wikiquote. Last update Jan. 24, 2022. History

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Robert Oppenheimer 25

American theoretical physicist and professor of physics 1904–1967

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

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