"If you're doing a biography, you try to stay as accurate as possible to reality. But you really don't know what was going on in the person's mind. You just know what was going on in the minds of people around him."

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To be sure, mathematics can be extended to any branch of knowledge, including economics, provided the concepts are so clearly defined as to permit accurate symbolic representation. That is only another way of saying that in some branches of discourse it is desirable to know what you are talking about.

— James R Newman