The manner in which things exist and take place, constitutes what is called the nature of things; and a careful observation of the nature of things is the sole foundation of all truth. (Jean-Baptiste Say)

The manner in which things exist and take place, constitutes what is called the nature of things; and a careful observation of the nature of things is the sole foundation of all truth.

Jean-Baptiste Say

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foundation manner nature observation place sole take truth things

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