We cannot know the primary causes; but they are subject to simple and constant laws, which we can discover by observation, the study of which is the subject of natural philosophy.

Les causes primordiales ne nous sont point connues; mais elles sont assujetties à des lois simples et constantes, que l'on peut découvrir par l'observation, et dont l'étude est l'objet de la philosophie naturelle.

Original text (French)

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