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I have been primarily interested in how and why ordinary people do unusual things, things that seem alien to their natures. Why do good people sometimes act evil? Why do smart people sometimes do dumb or irrational things?

我主要感兴趣的是普通人是如何以及为什么会做一些不同寻常的事情，这些事情似乎与他们的本性格格不入。为什么好人有时会作恶?为什么聪明人有时会做出愚蠢或不理智的事情?

— Philip Zimbardo 津巴多