"If people in the end think that you can't do something in a way which is acceptable then it won't fly. The only way you get anything like this done is if people think, 'I understand why it is being done.'"

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The practical man demands an appearance of reality at least. Always dealing in the concrete, he regards mathematical terms not as symbols or thought but as images of reality. A system acceptable to the mathematician because of its inner consistency may appear to the practical man to be full of contradictions because of the incomplete manner in which it represents reality.

— Tobias Dantzig