"It is a mania shared by philosophers of all ages to deny what exists and to explain what does not exist"
About this Quote
The line works because it flips philosophy’s self-myth. Philosophers claim to clarify reality; Rousseau suggests they often perform reality away. "Deny what exists" targets the impulse to treat lived experience - emotion, inequality, dependency, the stubborn mess of social life - as mere illusion or crude data to be refined into theory. "Explain what does not exist" skewers the opposite vice: building elaborate metaphysical machinery (states of nature, perfect rational actors, ideal republics) that smooths out contradiction by pretending it’s solvable on paper.
Context matters: Rousseau is writing in the high Enlightenment, when confidence in reason, system, and progress had a kind of imperial swagger. He’s inside that world yet constantly at war with it, suspicious of salon cleverness and the way abstraction can launder power. The subtext is ethical: bad philosophy isn’t just wrong; it’s socially consequential. If you deny what exists - actual suffering, actual corruption, actual dependence - you make it easier to govern by fantasy and call it truth.
Quote Details
| Topic | Reason & Logic |
|---|---|
| Source | Help us find the source |
| Cite |
Citation Formats
APA Style (7th ed.)
Rousseau, Jean-Jacques. (2026, January 17). It is a mania shared by philosophers of all ages to deny what exists and to explain what does not exist. FixQuotes. https://fixquotes.com/quotes/it-is-a-mania-shared-by-philosophers-of-all-ages-24328/
Chicago Style
Rousseau, Jean-Jacques. "It is a mania shared by philosophers of all ages to deny what exists and to explain what does not exist." FixQuotes. January 17, 2026. https://fixquotes.com/quotes/it-is-a-mania-shared-by-philosophers-of-all-ages-24328/.
MLA Style (9th ed.)
"It is a mania shared by philosophers of all ages to deny what exists and to explain what does not exist." FixQuotes, 17 Jan. 2026, https://fixquotes.com/quotes/it-is-a-mania-shared-by-philosophers-of-all-ages-24328/. Accessed 12 Feb. 2026.













