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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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But can there be any difficulty in proving, that vice and virtue are not matters of fact, whose existence we can infer by reason? Take any action allowed to be vicious: Wilful murder, for instance.

 The vice entirely escapes you, as long as you consider the object. Why we annex the idea of virtue to justice, and of vice to injustice. Mean while it may not be amiss to observe from these definitions of natural and unnatural, that nothing can be more unphilosophical than those systems, which assert, that virtue is the same with what is natural, and vice with what is unnatural. And though our judgments concerning the origin of any vice or virtue, be not so certain as those concerning their degrees; yet, since the question in this case regards not any philosophical origin of an obligation, but a plain matter of fact, it is not easily conceived how we can fall into an error.  Thus the course of the argument leads us to conclude, that since vice and virtue are not discoverable merely by reason, or the comparison of ideas, it must be by means of some impression or sentiment they occasion, that we are able to mark the difference betwixt them.