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Daily Inspiration Quote by Philip Zimbardo

"The line between good and evil is permeable and almost anyone can be induced to cross it when pressured by situational forces"

About this Quote

Comforting stories about monsters fail us because they flatter us. Zimbardo’s line is an attack on the moral selfie: the idea that “good people” stay good because of inner virtue, while “bad people” are simply built wrong. By calling the boundary between good and evil “permeable,” he makes morality sound less like a wall and more like a membrane - something that can be stressed, thinned, and punctured by heat, fear, hierarchy, and time.

The intent is bluntly corrective. Zimbardo, speaking from the worldview that produced (and was later criticized through) the Stanford Prison Experiment, wants you to stop treating cruelty as a personality trait and start treating it as an environment you can engineer. The subtext is political: if situational forces can induce ordinary people to harm, then institutions carry moral responsibility. “I was just following orders” isn’t a personal excuse; it’s evidence of a predictable system.

The phrase “almost anyone” is doing the provocative work. It’s not a claim that everyone will become sadistic; it’s a warning about the human talent for adaptation. Under pressure, people don’t just obey - they rationalize, they bond with roles, they outsource conscience to procedure. Evil, in this framing, is often paperwork, peer approval, and small escalations that feel temporary until they’re not.

Context matters because Zimbardo’s legacy is a cautionary tale in both directions: about how quickly roles can deform behavior, and about how eagerly we accept dramatic demonstrations as proof. Either way, the quote lands: vigilance isn’t just self-control; it’s designing situations that don’t make cruelty the easiest option.

Quote Details

TopicEthics & Morality
SourceHelp us find the source
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Citation Formats

APA Style (7th ed.)
Zimbardo, Philip. (2026, January 15). The line between good and evil is permeable and almost anyone can be induced to cross it when pressured by situational forces. FixQuotes. https://fixquotes.com/quotes/the-line-between-good-and-evil-is-permeable-and-157041/

Chicago Style
Zimbardo, Philip. "The line between good and evil is permeable and almost anyone can be induced to cross it when pressured by situational forces." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/the-line-between-good-and-evil-is-permeable-and-157041/.

MLA Style (9th ed.)
"The line between good and evil is permeable and almost anyone can be induced to cross it when pressured by situational forces." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/the-line-between-good-and-evil-is-permeable-and-157041/. Accessed 12 Feb. 2026.

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Philip Zimbardo on the Permeable Line Between Good and Evil
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About the Author

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Philip Zimbardo (born March 23, 1933) is a Psychologist from USA.

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