"The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals"
About this Quote
The subtext is a rebuke to complacent consensus. "Right to exist" sounds like moral language, then he quietly strips it of moral shelter. There are no entitlements in the marketplace of hypotheses, only stress tests. "Resisting extinction" is doing double duty: it evokes the drama of survival while framing debate as an ecosystem where weak explanations die off, not because they're unpopular, but because they can't metabolize new facts.
Context sharpens the edge. In the late 19th century, science was professionalizing, argument was public spectacle, and Darwinism was being misread as a social creed. Huxley’s formulation is careful: he’s not claiming that the most aggressive idea wins, only that durability is earned through confrontation. It’s an early sketch of peer review as natural selection, and a warning that intellectual progress isn’t a gentle accumulation; it’s an attrition campaign against comforting stories.
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APA Style (7th ed.)
Huxley, Thomas. (2026, January 15). The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals. FixQuotes. https://fixquotes.com/quotes/the-struggle-for-existence-holds-as-much-in-the-18031/
Chicago Style
Huxley, Thomas. "The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/the-struggle-for-existence-holds-as-much-in-the-18031/.
MLA Style (9th ed.)
"The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/the-struggle-for-existence-holds-as-much-in-the-18031/. Accessed 19 Feb. 2026.







