"You have to know human behaviour … And the quality of your writing is absolutely capped at your understanding of human behaviour. You’ll never write above what you know about people."

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Human behaviour reveals uniformities which constitute natural laws. If these uniformities did not exist, then there would be neither social science nor political economy, and even the study of history would largely be useless. In effect, if the future actions of men having nothing in common with their past actions, our knowledge of them, although possibly satisfying our curiosity by way of an interesting story, would be entirely useless to us as a guide in life.

— Vilfredo Pareto