"An expert is a man who has made all the mistakes which can be made, in a narrow field"
About this Quote
The intent is not anti-intellectual. It’s anti-mystique. In physics, you don’t become reliable by being brilliant in the abstract; you become reliable by repeatedly being wrong in ways that teach you what can’t work. Bohr, a central architect of quantum theory, lived through a period when the old rules stopped behaving. Early 20th-century physics was a graveyard of confident assumptions: classical intuition, deterministic comfort, the belief that observation could stay politely separate from phenomena. The “mistakes” weren’t embarrassing detours; they were the engine of progress.
“Narrow field” is the crucial qualifier. Bohr is warning that competence is local. The same person who can anticipate every failure mode in spectroscopy may be a novice in politics, parenting, or pandemics. The subtext lands squarely on modern life: expertise is real, hard-won, and worth respecting, but it’s not omniscience. Trust the expert for their map of known pitfalls, not for prophecy.
Quote Details
| Topic | Learning from Mistakes |
|---|---|
| Source | Later attribution: The Secrets of Hidden Knowledge (Ayub V. O. Ofulla, 2013) modern compilationISBN: 9781458209306 · ID: OYWIAAAAQBAJ
Evidence:
... An expert is a man who has made all the mistakes which can be made, in a narrow field.” —Niels Bohr Ethical, Moral and Legal Issues in Research and Projects Researchers whose subjects are people or animals must consider the conduct of ... |
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Citation Formats
APA Style (7th ed.)
Bohr, Niels. (2026, February 8). An expert is a man who has made all the mistakes which can be made, in a narrow field. FixQuotes. https://fixquotes.com/quotes/an-expert-is-a-man-who-has-made-all-the-mistakes-25372/
Chicago Style
Bohr, Niels. "An expert is a man who has made all the mistakes which can be made, in a narrow field." FixQuotes. February 8, 2026. https://fixquotes.com/quotes/an-expert-is-a-man-who-has-made-all-the-mistakes-25372/.
MLA Style (9th ed.)
"An expert is a man who has made all the mistakes which can be made, in a narrow field." FixQuotes, 8 Feb. 2026, https://fixquotes.com/quotes/an-expert-is-a-man-who-has-made-all-the-mistakes-25372/. Accessed 12 Feb. 2026.









