"Discrepancy between theory and practice, which in sound physical and mechanical science is a delusion, has a real existence in the minds of men; and that fallacy, through rejected by their judgments, continues to exert and influence over their acts."

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Every interview with a public figure should include the question "What have you been wrong about, and how did that change your views?" The answer will tell us if the person is intellectually honest or a tale spinner with delusions of infallibility.

— Stewart Brand