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Cliquer sur les phrases pour les voir dans leur contexte. Les textes de Immanuel Kant et David Hume sont disponibles auprès du Projet Gutenberg.

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For whether the passion of self-interest be esteemed vicious or virtuous, it is all a case; since itself alone restrains it: So that if it be virtuous, men become social by their virtue; if vicious, their vice has the same effect.

 So much the wider field, it may appear, lies open to hypothesis; as, where we cannot know with certainty, we are at liberty to make guesses and to form suppositions. Mathematical science affords us a brilliant example, how far, independently of all experience, we may carry our a priori knowledge.