Thomas Aquinas — "It is lawful to kill a man who is a public sinner and incorrigible."
It is lawful to kill a man who is a public sinner and incorrigible.
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More from Thomas Aquinas
"The existence of God is a self-evident truth, but not to us."
"It is impossible for any created intellect to comprehend God."
"A slave is an instrument of his master, and is his property."
"The end of government is the common good."
"The perfection of human life consists in the knowledge of God."
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Understanding this quote
What it means
Society holds the legitimate authority to execute a person who openly and persistently commits grave wrongs and refuses all correction. This is not personal vengeance but public protection: an incorrigible wrongdoer, like a diseased limb, threatens the health of the whole community. The lawfulness comes from protecting the common good, not from punishing sin itself as a private matter.
Relevance to Thomas Aquinas
Aquinas built his entire philosophy around ordered reason serving the common good. Drawing on Aristotle, he viewed society as a natural body where the ruler acts like a physician. His Summa Theologica explicitly defends capital punishment using the amputated-limb analogy. As a Dominican friar during active Inquisition efforts, questions of heresy, public scandal, and incorrigibility were not abstract to him.
The era
Thirteenth-century Christendom fused religious and civil authority entirely. Capital punishment for heresy, apostasy, and persistent public sin was practiced and theologically defended across Europe. The Inquisition was formally established during Aquinas's lifetime. Society viewed uncorrected public sinners as genuine threats to communal salvation, not just civic order, making the execution of the incorrigible a matter of spiritual and political necessity.
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