"It is not enough to have a good mind; the main thing is to use it well"
About this Quote
The subtext is a rebuke to complacent intelligence: being bright is not a credential, it’s a responsibility. “Use it well” carries an almost ethical charge, suggesting that reason can be mishandled the way power can. Descartes isn’t praising the mind as a mystical gift; he’s demoting it to an instrument that can be calibrated, tested, and improved. That’s the same sensibility behind his broader project: skepticism as a tool, not a mood; doubt as a controlled experiment meant to burn away error and leave something sturdier behind.
Context matters: Descartes is writing in the early modern moment when mathematics, optics, and physics are rewriting what counts as proof. His method doesn’t flatter the Renaissance ideal of the brilliant polymath; it favors the thinker who can follow a procedure even when ego wants shortcuts. The quote works because it quietly turns intellect into practice. It’s not “be smart.” It’s “be responsible with your smart,” a maxim that still stings in an era addicted to hot takes and effortless cleverness.
Quote Details
| Topic | Wisdom |
|---|---|
| Source | Verified source: Discours de la méthode (Rene Descartes, 1637)
Evidence: Car ce n'est pas assez d'avoir l'esprit bon, mais le principal est de l'appliquer bien. (Partie I). This is Descartes’ original French sentence in Part I of Discours de la méthode (first published in 1637 at Leiden). The widely-circulated English version (“It is not enough to have a good mind; the main thing is to use it well”) is a translation/paraphrase of this line. Other candidates (1) Awaken the Giant Within (Tony Robbins, 2007) compilation95.0% ... It is not enough to have a good mind ; the main thing is to use it well . " -RENE DESCARTES What the science of N... |
| Cite |
Citation Formats
APA Style (7th ed.)
Descartes, Rene. (2026, February 12). It is not enough to have a good mind; the main thing is to use it well. FixQuotes. https://fixquotes.com/quotes/it-is-not-enough-to-have-a-good-mind-the-main-1325/
Chicago Style
Descartes, Rene. "It is not enough to have a good mind; the main thing is to use it well." FixQuotes. February 12, 2026. https://fixquotes.com/quotes/it-is-not-enough-to-have-a-good-mind-the-main-1325/.
MLA Style (9th ed.)
"It is not enough to have a good mind; the main thing is to use it well." FixQuotes, 12 Feb. 2026, https://fixquotes.com/quotes/it-is-not-enough-to-have-a-good-mind-the-main-1325/. Accessed 12 Feb. 2026.










