Niels Bohr — "The progress of science depends on the freedom of thought."
The progress of science depends on the freedom of thought.
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More from Niels Bohr
"The purpose of science is not to answer ultimate questions, but to make progress in understanding."
"The pursuit of knowledge is an endless journey."
"When we measure something we are forcing an undetermined, undefined world to assume an experimental value. We are not measuring the world, we are creating it."
"No, I certainly do not believe in this superstition. But you know, they say that it does bring luck even if you don't believe in it!"
"We are all agreed that the only way of getting a correct impression of the world is to be a part of it."
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Understanding this quote
What it means
Scientific advancement requires the ability to question, challenge, and overturn existing ideas without institutional, political, or ideological interference. When researchers can pursue unconventional hypotheses, debate openly, and publish freely, knowledge compounds across generations. Suppress that freedom through censorship, dogma, or coercion, and science stagnates. Discoveries depend not just on intelligence or resources, but on intellectual environments where no idea is automatically forbidden from examination.
Relevance to Niels Bohr
Bohr built the Copenhagen Institute for Theoretical Physics in 1920 as a model of open scientific dialogue, hosting Einstein, Heisenberg, and Pauli in relentless debate. He believed productive science demanded every assumption be challenged. When Nazi Germany occupied Denmark in 1940, Bohr—partly Jewish—protected refugee scientists until fleeing in 1943. His post-war push for international atomic transparency reflected his lifelong conviction that science thrives only when political borders and state secrecy retreat.
The era
Bohr's working years spanned catastrophic ideological conflicts. Nazi Germany expelled Jewish scientists and declared quantum mechanics 'Jewish physics.' Soviet Lysenkoism rejected genetics in favor of politically approved pseudoscience, setting Soviet biology back decades. The Manhattan Project revealed how states could militarize and classify science entirely. Against this backdrop, Bohr lobbied Roosevelt and Churchill to share atomic knowledge internationally, arguing that openness—not secrecy—was the only path to lasting global stability.
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