Isaac Newton — "I feign no hypotheses."
I feign no hypotheses.
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More from Isaac Newton
"Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it."
"Plato is my friend, Aristotle is my friend, but my greatest friend is truth."
"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"The motions which the planets now have could not spring from any natural cause alone, but were impressed by an intelligent Agent."
"If I have done the public any service, it is due to my patient thought."
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Understanding this quote
What it means
I don't invent explanations I can't prove. When I don't have experimental evidence for something, I won't pretend I do. Science should describe what we observe and measure, not fabricate convenient stories to fill gaps. If the data doesn't support a claim, that claim doesn't belong in serious inquiry — silence is more honest than speculation dressed up as knowledge.
Relevance to Isaac Newton
Newton wrote this in the Principia Mathematica defending his law of universal gravitation. Critics demanded he explain why gravity worked — what mechanism caused it. Newton refused to speculate without evidence. This was radical intellectual discipline: he had derived the mathematical laws governing planetary motion precisely, but wouldn't fabricate a causal mechanism he couldn't demonstrate. His entire career was built on this empirical rigor.
The era
In Newton's era, natural philosophers routinely invented elaborate mechanical explanations — vortices, ethers, occult forces — to account for phenomena. Descartes filled the universe with invisible swirling matter to explain planetary orbits. Newton's refusal to do the same was a deliberate break with that tradition, helping establish the modern scientific standard that observation and mathematics, not invented mechanisms, constitute legitimate natural philosophy.
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