Carl Sagan — "The price we pay for the suppression of doubt is that we can never be sure of an…"
The price we pay for the suppression of doubt is that we can never be sure of anything.
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More from Carl Sagan
"Science is a way of thinking much more than it is a body of knowledge."
"The suppression of uncomfortable ideas may be common in religion and politics, but it is not the way to do science."
"The notion that the pre-Copernican Earth was flat is a common misconception."
"If we are to survive, we must be willing to change."
"The truth may be puzzling. It may take some effort to grasp. It may be counterintuitive. It may contradict deeply held prejudices. It may not be easy to do what the truth demands. But none of that mak…"
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Understanding this quote
What it means
When we silence doubt and stop questioning our beliefs, we lose the very mechanism that allows us to verify truth. Certainty bought through suppressing skepticism is counterfeit — it feels solid but has no foundation. Genuine knowledge requires entertaining the possibility of being wrong; without that willingness, we cannot distinguish what we actually know from what we merely believe.
Relevance to Carl Sagan
Sagan built his career on rigorous skepticism, famously developing the 'baloney detection kit' and championing critical thinking. As an astronomer confronting pseudoscience, UFO claims, and Cold War nuclear certainty, he witnessed how suppressing doubt led to dangerous dogma. His book 'The Demon-Haunted World' is essentially a manual for why doubt is science's most essential tool.
The era
Sagan lived through the Cold War, where ideological certainty on both sides brought humanity near nuclear annihilation. The late 20th century saw religious fundamentalism resurging alongside pseudoscience movements — astrology, creationism, faith healing. Simultaneously, science itself was revolutionizing cosmology. This tension between demanded certainty and the humility science requires made Sagan's defense of doubt urgently necessary.
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