"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true"
About this Quote
The second barb - “nor whether what we are saying is true” - isn’t anti-math nihilism so much as a wink at the fragility of foundations. Russell lived through the era when mathematics was being rebuilt on logic, and he personally helped expose cracks in the project (Russell’s paradox detonated naive set theory). “True” in math is conditional: true given axioms, true within a system, true until a hidden contradiction or an undecidable statement shows up. That subtext anticipates the 20th century’s big humbling lesson: even the most formal language has limits (later sharpened by Godel).
The line’s wit is that it reverses our hierarchy of confidence. The less a discipline clings to worldly meaning, the more precise it can be; the more rigorously it defines “truth,” the more it has to admit that truth depends on the rules of the game.
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| Topic | Truth |
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| Source | Help us find the source |
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APA Style (7th ed.)
Russell, Bertrand. (2026, January 15). Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true. FixQuotes. https://fixquotes.com/quotes/mathematics-may-be-defined-as-the-subject-in-4929/
Chicago Style
Russell, Bertrand. "Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/mathematics-may-be-defined-as-the-subject-in-4929/.
MLA Style (9th ed.)
"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/mathematics-may-be-defined-as-the-subject-in-4929/. Accessed 12 Feb. 2026.





