Max Planck — "The freedom of thought and speech must be preserved in all circumstances."
The freedom of thought and speech must be preserved in all circumstances.
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More from Max Planck
"I started from the assumption that the energy of an oscillator is quantized. I did this in an act of desperation."
"The greatest joy of a scientist is to see a new truth emerge."
"The true scientist is a man who is always asking questions, and never satisfied with the answers."
"The progress of science depends on the freedom of thought."
"The scientist must be a dreamer and a realist at the same time."
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Understanding this quote
What it means
Freedom of thought and freedom of speech are non-negotiable rights that must be protected even when it is difficult or dangerous to do so. No political pressure, social hostility, or institutional authority should be allowed to override them. Whatever the circumstance, people must remain free to form their own conclusions, voice disagreement, and pursue truth openly without fear of punishment or suppression by those in power.
Relevance to Max Planck
Planck lived through Nazi Germany, where scientific inquiry was twisted by ideology and Jewish physicists like Einstein were persecuted as practitioners of 'Jewish physics.' As head of the Kaiser Wilhelm Society, Planck personally appealed to Hitler to protect Jewish colleagues. His son Erwin was executed in 1945 for plotting against Hitler. For the founder of quantum theory, whose work required radical intellectual freedom, defending open inquiry was existential, not abstract.
The era
Planck's era spanned Imperial Germany, Weimar, the Third Reich, and postwar reconstruction. Under Nazi rule, universities were purged, books burned, and 'German physics' ideologues attacked relativity and quantum theory as corrupt. Scientists were forced to sign loyalty oaths or flee. After 1945, Germany faced denazification and the rebuilding of its intellectual institutions amid Cold War censorship on both sides, making explicit defenses of free thought urgent and politically charged throughout his life.
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