Galileo Galilei — "Ignorance is the root of all evil."
Ignorance is the root of all evil.
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More from Galileo Galilei
"Ignorance is the parent of fear."
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"The greater the number of people who believe a proposition, the more likely it is to be false."
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Details
A philosophical maxim, widely attributed but common in various forms.
Date: c. 1600s
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Understanding this quote
What it means
Lack of knowledge—not mere stupidity but willful blindness, superstition, and refusal to examine evidence—is the source from which all human harm flows. When people operate without understanding, they make destructive choices, follow false authorities, and perpetuate systems that hurt others. The cure isn't morality lectures but genuine understanding: learn how the world actually works, and ethical action follows. Evil thrives precisely where minds remain closed to evidence and inquiry.
Relevance to Galileo Galilei
Galileo staked his life on the idea that evidence defeats dogma. His telescopic proof of heliocentrism—moons orbiting Jupiter, phases of Venus—directly challenged centuries of Church-endorsed ignorance. The Inquisition forced him to recant in 1633 and placed him under house arrest until death. He watched scientific progress blocked not by lack of intelligence but by institutions choosing ignorance over observation. This quote encapsulates his lifelong battle: knowledge is liberation; its suppression is civilization's greatest danger.
The era
Galileo lived during the Scientific Revolution and Counter-Reformation, when the Catholic Church aggressively reasserted doctrinal authority through the Inquisition and the Index of Forbidden Books. Copernicus's heliocentric model had been condemned; Giordano Bruno was burned at the stake in 1600 for heretical ideas. Received wisdom—Aristotle, scripture—carried legal force against empirical inquiry. In this climate, naming ignorance as evil's root was not philosophy but a direct indictment of the era's most powerful institutions.
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