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Daily Inspiration Quote by Isaac Newton

"I can calculate the motion of heavenly bodies, but not the madness of people"

About this Quote

Newton’s line lands because it weaponizes his own legend against the messy creature he actually had to live among: humans. The man who helped make the universe legible with math frames people as the one remaining unsolved problem, and the contrast is the whole punch. “Heavenly bodies” suggests a cosmos that obeys rules whether it wants to or not; “madness of people” points to crowds, courts, rivals, and markets: domains where ego, panic, and gossip can beat any equation.

The subtext isn’t that humans are unknowable in some mystical sense. It’s that social behavior is volatile, feedback-driven, and contagious. An orbit doesn’t care who’s watching. A person does. A mob cares even more. Newton’s frustration reads like early modern déjà vu: the same period that birthed scientific method also churned with political upheaval, financial speculation, religious conflict, and status games. He’s implicitly admitting the limits of a worldview that works beautifully on planets but poorly on passions.

Context sharpens the bite. Newton wasn’t a cloistered sage floating above society; he fought fierce priority disputes, navigated patronage, and later ran the Royal Mint, policing counterfeiters in a very un-astronomical trench war of incentives and deception. The quote’s intent, then, is partly humility and partly warning: don’t confuse predictive power in physics with mastery over human systems. It’s a reminder that the hardest “science” might be the one conducted inside a crowded room.

Quote Details

TopicWisdom
Source
Later attribution: The Wisdom and Madness of Juggling (Dan Diaz, 2025) modern compilation
Text match: 95.00%   Provider: Google Books
Evidence:
... I can calculate the motion of heavenly bodies but not the madness of people . " -Sir Isaac Newton . I thought that one was appropriate because it had to do with the title of this book . That was probably easy for you to figure out ...
Other candidates (3)
An American Suffragette (Stevens, Isaac Newton, 1920) primary44.1%
sive face reflected the emotion of every leading role she partook of the abandon of the gayer
Isaac Newton (Isaac Newton) compilation43.0%
ves only to disturb and retard the motions of those great bodies and make the frame of nature
Nuovo corso di chimica secondo i principi di Newton, e di... (Senac, M. de (Jean-Baptiste), 1693-1770, 1750) primary36.6%
io che la prima parte che forma la bafe dellalbero attiri tut te je altre partis e non folame
Cite

Citation Formats

APA Style (7th ed.)
Newton, Isaac. (2026, February 7). I can calculate the motion of heavenly bodies, but not the madness of people. FixQuotes. https://fixquotes.com/quotes/i-can-calculate-the-motion-of-heavenly-bodies-but-31626/

Chicago Style
Newton, Isaac. "I can calculate the motion of heavenly bodies, but not the madness of people." FixQuotes. February 7, 2026. https://fixquotes.com/quotes/i-can-calculate-the-motion-of-heavenly-bodies-but-31626/.

MLA Style (9th ed.)
"I can calculate the motion of heavenly bodies, but not the madness of people." FixQuotes, 7 Feb. 2026, https://fixquotes.com/quotes/i-can-calculate-the-motion-of-heavenly-bodies-but-31626/. Accessed 12 Feb. 2026.

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I can calculate heavenly motions but not the madness of people
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About the Author

Isaac Newton

Isaac Newton (December 25, 1642 - March 20, 1727) was a Mathematician from England.

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Madalyn Murray O'Hair, Writer