"Evil is knowing better, but willingly doing worse"
About this Quote
The subtext is a direct rebuke to the stories societies tell after the fact: "I didn't realize", "I was just following orders", "Everyone was doing it". Zimbardo is famous for studying how environments and roles can pull ordinary people into cruelty, but this line insists on the remaining kernel of agency. Situation matters, power matters, institutions matter; still, there's a moment when a person recognizes the moral cost and pays it anyway because it's easier, rewarded, or socially lubricated. "Willingly" is doing enormous work here, pointing to complicity as an active verb, not a passive condition.
Contextually, the quote sits in the long shadow of the Stanford Prison Experiment and Zimbardo's later writing about the "banality" and normalcy of wrongdoing. It's also a warning aimed at the rest of us: if evil requires only the small betrayal of what you already know, then it's not a monster in the room. It's the part of the room that feels familiar.
Quote Details
| Topic | Ethics & Morality |
|---|---|
| Source | Later attribution: How Psychology Works (DK, 2018) modern compilationISBN: 9780241360415 · ID: UDVZDwAAQBAJ
Evidence:
... Philip Zimbardo discovered in his 1971 Stanford prison experiment ( p.151 ) that if you put ordinary people in ... Evil is knowing better , but willingly doing worse . " Philip Zimbardo , American psychologist Bad barrel This idea ... |
| Cite |
Citation Formats
APA Style (7th ed.)
Zimbardo, Philip. (2026, March 21). Evil is knowing better, but willingly doing worse. FixQuotes. https://fixquotes.com/quotes/evil-is-knowing-better-but-willingly-doing-worse-121055/
Chicago Style
Zimbardo, Philip. "Evil is knowing better, but willingly doing worse." FixQuotes. March 21, 2026. https://fixquotes.com/quotes/evil-is-knowing-better-but-willingly-doing-worse-121055/.
MLA Style (9th ed.)
"Evil is knowing better, but willingly doing worse." FixQuotes, 21 Mar. 2026, https://fixquotes.com/quotes/evil-is-knowing-better-but-willingly-doing-worse-121055/. Accessed 30 Mar. 2026.











