The interviewer's principle is to listen to what people say and observe what they do.
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From 《论语·公冶长》: 始吾于人也,听其言而信其行;今吾于人也,听其言而观其行 — Confucius says he used to trust a person's actions based on their words, but now he listens to words and watches actions independently. The shift is from naive trust to evidence-based judgment.