Niels Bohr — "Never express yourself more clearly than you are able to think."
Never express yourself more clearly than you are able to think.
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More from Niels Bohr
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"The great thing is to be able to make a mistake without knowing it."
"The quantum postulate implies that any observation of atomic phenomena will involve an interaction with the agency of observation which is not negligible."
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Understanding this quote
What it means
Don't dress up half-formed ideas in polished language. Clear words can fool you and your audience into believing the underlying thinking is equally clear, when in reality the concept is still fuzzy, incomplete, or contradictory. Match the precision of your expression to the precision of your actual understanding. If a notion is tentative, speak tentatively. Premature certainty in phrasing locks in confusion, hides gaps, and stops you from doing the harder work of actually figuring out what you mean.
Relevance to Niels Bohr
Bohr built quantum theory on concepts that stretched language past its breaking point: complementarity, wave-particle duality, observer-dependent reality. He famously rewrote drafts endlessly, dictating sentences dozens of times, because he refused to say more than he genuinely grasped. His lectures were notoriously groping and hesitant, frustrating listeners who wanted crispness. That hesitation was principled: for Bohr, atomic reality was so strange that any fluent, confident description was almost certainly wrong. Ambiguity honored the physics.
The era
Bohr worked through the 1920s-30s quantum revolution, when classical intuitions collapsed and physicists like Einstein, Heisenberg, and Schrödinger fought over what equations actually meant. Popular science writing was exploding, and journalists demanded tidy explanations of relativity and atoms. Meanwhile logical positivists in Vienna were insisting every meaningful statement be precisely verifiable. Bohr pushed back against both pressures, arguing that forcing clean language onto genuinely unfinished ideas, whether in physics or philosophy, was intellectually dishonest and scientifically dangerous.
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