Thomas Aquinas — "Heretics can not only be excommunicated, but also justly killed."
Heretics can not only be excommunicated, but also justly killed.
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More from Thomas Aquinas
"The end of government is the common good."
"The proper good of a thing is its perfection."
"The intellect is perfected by truth, and the will by good."
"It is lawful to take usury from Jews."
"Good can exist without evil, whereas evil cannot exist without good."
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Understanding this quote
What it means
The quote asserts that people who deviate from Catholic doctrine deserve not just removal from the Church community but execution. Aquinas reasoned that heresy—corrupting spiritual truth—was a graver offense than counterfeiting currency, which society already punished by death. Since eternal souls were at stake, he argued the state was justified in killing unrepentant heretics to protect the faithful from spiritual contamination and preserve doctrinal unity.
Relevance to Thomas Aquinas
Aquinas wrote this in his Summa Theologica (II-II, Q.11), his life's masterwork synthesizing Christian faith with Aristotelian logic. A Dominican friar who sacrificed family expectations to enter a mendicant order, his identity was inseparable from orthodoxy. He believed protecting revealed truth was a supreme moral obligation. This view was not a fringe position for him—it followed logically from his framework that eternal souls outweigh earthly life in every moral calculation.
The era
In 13th-century Europe, heresy was simultaneously a theological crime and a civil threat to social order. The Albigensian Crusade (1209–1229) had just crushed the Cathar movement by military force. Pope Gregory IX formally established the Inquisition in 1231, institutionalizing heresy prosecution. Church and state were deeply intertwined—secular rulers enforced Church decrees under threat of their own excommunication. Aquinas wrote in a world where doctrinal uniformity was considered foundational to civilization itself.
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