“I was just trying to show you,” he went on, “just how insubstantial a ‘common sense’ idea can be when you pin it down. Neither ‘common sense’ nor ‘l… - Robert A. Heinlein

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“I was just trying to show you,” he went on, “just how insubstantial a ‘common sense’ idea can be when you pin it down. Neither ‘common sense’ nor ‘logic’ can prove anything. Proof comes from experiment, or to put it another way, from experience, and from nothing else.”