"The first precept was never to accept a thing as true until I knew it as such without a single doubt"
About this Quote
The specific intent is methodological, not merely skeptical. He’s not advocating permanent doubt; he’s designing a filter so strict that whatever survives can serve as a foundation for knowledge, especially in mathematics and the new physics. The “first precept” language matters: it reads like a rulebook for rebuilding a mind, step by step, as if reason could be engineered. “Without a single doubt” isn’t casual bravado; it’s an aspiration toward clarity and distinctness, the kind of mental precision that geometry models and that Descartes wants philosophy to imitate.
The subtext is a cultural wager: if you can ground truth in the individual’s rational inspection rather than tradition, you can produce knowledge that travels across borders, sects, and regimes. That’s liberating and destabilizing. It licenses the modern idea that legitimacy comes from justification, not lineage. It also reveals a fear: if you start from contaminated premises, everything built atop them is suspect. Descartes’ rigor is partly a response to an era of intellectual and religious conflict, where certainty was claimed loudly and inconsistently. His move is to make certainty expensive, and by doing so, make it worth something again.
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APA Style (7th ed.)
Descartes, Rene. (2026, January 18). The first precept was never to accept a thing as true until I knew it as such without a single doubt. FixQuotes. https://fixquotes.com/quotes/the-first-precept-was-never-to-accept-a-thing-as-1330/
Chicago Style
Descartes, Rene. "The first precept was never to accept a thing as true until I knew it as such without a single doubt." FixQuotes. January 18, 2026. https://fixquotes.com/quotes/the-first-precept-was-never-to-accept-a-thing-as-1330/.
MLA Style (9th ed.)
"The first precept was never to accept a thing as true until I knew it as such without a single doubt." FixQuotes, 18 Jan. 2026, https://fixquotes.com/quotes/the-first-precept-was-never-to-accept-a-thing-as-1330/. Accessed 12 Feb. 2026.











