Isaac Newton — "I shall not mingle conjectures with certainties."
I shall not mingle conjectures with certainties.
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More from Isaac Newton
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Understanding this quote
What it means
Newton commits to keeping speculation entirely separate from proven fact. He refuses to present guesses as established truths. Don't dress up what you merely suspect as something you actually know. Present only what evidence firmly supports as certain, and label everything else as tentative. It is a discipline of intellectual honesty—never letting plausible-sounding ideas contaminate the credibility of demonstrated, verified conclusions, no matter how tempting those ideas might be.
Relevance to Isaac Newton
Newton wrote 'Hypotheses non fingo'—I feign no hypotheses—in his Principia Mathematica, directly echoing this principle. He refused to speculate on why gravity acts at a distance, only proving mathematically that it does. His decades-long delay before publishing the Principia, his meticulous verification of optics experiments, and his sharp separation of published science from his private alchemical investigations all reflect a man who demanded ironclad proof before staking any public claim.
The era
Newton worked during the Scientific Revolution, when natural philosophy was shedding centuries of Aristotelian conjecture. The Royal Society, founded in 1660, explicitly demanded observation over authority. Yet alchemy, astrology, and speculative cosmology still pervaded intellectual life—even Newton privately pursued alchemy. His insistence on separating certainty from conjecture was a radical disciplinary standard in an era where scholastic tradition and theological authority routinely substituted for empirical demonstration.
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