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Who really said it

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

Not Oppenheimer — adapted from Cabell James Branch Cabell Novelist
Disputed Free to reuse

Wikiquote identifies the supposed Oppenheimer line as a version of James Branch Cabell’s The Silver Stallion. Cabell’s sentence uses “proclaims” and “we live,” rather than the circulating version’s “thinks this is.” Source and attribution evidence ↗

Last verified 9 Nov 2026 · how we verify · spot an error?

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Disputed credit — copy with the correction

“The Optimist thinks this is the best of all possible worlds, the Pessimist fears it is true” — James Branch Cabell · Verbatim: “The optimist proclaims that we live in the best of all possible worlds; and the pessimist fears this is true.”

The slide-ready mistake: crediting this to J. Robert Oppenheimer. Use the credit shown above instead.

Can you use it?

Free to use, including in commercial and paid presentations — no permission or licence needed.

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In context

Evoking the world of James Branch Cabell — Novelist. Theme: "The Optimist thinks this is the best of all possible worlds, the Pessimist fears it is true". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.

Minimalist

Minimalist editorial slide for the quote "The Optimist thinks this is the best of all possible worlds, the Pessimist fears it is true". Clean background, a single muted accent color, generous negative space, subtle paper or linen texture, no literal illustration — let the words carry it. Reserve clear space for a serif quote and a small credit line. No lettering in the image itself.

Provenance

The source

Source
The Silver Stallion (1926)
Evidence
Source trail checked; limitations stated

The optimist proclaims that we live in the best of all possible worlds; and the pessimist fears this is true.

Documented wording; compare the popular version at the top.

Source and attribution evidence

How we verified this

  • Wikiquote identifies the supposed Oppenheimer line as a version of James Branch Cabell’s The Silver Stallion. Cabell’s sentence uses “proclaims” and “we live,” rather than the circulating version’s “thinks this is.” Source and attribution evidence ↗
  • The documented wording is a literary paradox: the optimist’s ideal world becomes the pessimist’s nightmare. The correction should retain the wording distinction as well as reassigning the source. Read the supporting source ↗
Public domain

The documented original comes from a work published before 1931 and is in the US public domain. This does not automatically license a later adaptation or a new edition’s additions.

Rights status is our research, not legal advice — and copyright varies by country and edition. For commercial or published use, confirm with the rightsholder. See terms.

Fact-check

Often misattributed

Wikiquote identifies the supposed Oppenheimer line as a version of James Branch Cabell’s The Silver Stallion. Cabell’s sentence uses “proclaims” and “we live,” rather than the circulating version’s “thinks this is.”

J. Robert Oppenheimer Wording changed

The documented wording is a literary paradox: the optimist’s ideal world becomes the pessimist’s nightmare. The correction should retain the wording distinction as well as reassigning the source. Source and attribution evidence ↗

Wikiquote identifies the supposed Oppenheimer line as a version of James Branch Cabell’s The Silver Stallion. Cabell’s sentence uses “proclaims” and “we live,” rather than the circulating version’s “thinks this is.” Source and attribution evidence ↗

Explore

Filed under

More provenance-checked quotes on the same theme, each with its reuse status.

Hope Doubt

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Source and attribution evidenceen.wikiquote.org

Wikiquote traces the Oppenheimer wording to Cabell’s The Silver Stallion1926 and gives a different sentence.

The author

About James Branch Cabell

James Branch Cabell

Novelist

James Branch Cabell wrote The Silver Stallion. Wikiquote identifies his novel as the source behind the optimist-and-pessimist paradox later attributed to Oppenheimer.

For writers & researchers

Cite this

The primary source (Chicago)

The Silver Stallion (1926). See the linked evidence for the wording and attribution limitations.

This verification page

Quotle.info. “Who really said ‘The Optimist thinks this is the best of all possible worlds, the Pessimist fears it is true’?” Last verified 9 Nov 2026. https://quotle.info/who-said/the-optimist-thinks-this-is-the-best-of-all-possible-worlds/

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