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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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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.

 Ideas always represent their objects or impressions; and vice versa, there are some objects necessary to give rise to every idea. For granting that morality had no foundation in nature, it must still be allowed, that vice and virtue, either from self-interest or the prejudices of education, produce in us a real pain and pleasure; and this we may observe to be strenuously asserted by the defenders of that hypothesis. But it is certain, that self-love, when it acts at its liberty, instead of engaging us to honest actions, is the source of all injustice and violence; nor can a man ever correct those vices, without correcting and restraining the natural movements of that appetite. The uneasiness and satisfaction are not only inseparable from vice and virtue, but constitute their very nature and essence. Now, as a like uncertainty and variety of causes take place, even in natural objects, and produce a like error in our judgment, if that tendency to produce error were the very essence of vice and immorality, it should follow, that even inanimate objects might be vicious and immoral. In saying, then, that the sentiments of vice and virtue are natural in this sense, we make no very extraordinary discovery. Thus animals have little or no sense of virtue or vice; they quickly lose sight of the relations of blood; and are incapable of that of right and property: For which reason the causes of their pride and humility must lie solely in the body, and can never be placed either in the mind or external objects.