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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 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.

 Why we annex the idea of virtue to justice, and of vice to injustice. As to the third sense of the word, it is certain, that both vice and virtue are equally artificial, and out of nature. But supposing this hypothesis of moral philosophy should be allowed to be false, it is still evident, that pain and pleasure, if not the causes of vice and virtue, are at least inseparable from them. They must necessarily be placed either in ourselves or others, and excite either pleasure or uneasiness; and therefore must give rise to one of these four passions; which clearly distinguishes them from the pleasure and pain arising from inanimate objects, that often bear no relation to us: And this is, perhaps, the most considerable effect that virtue and vice have upon the human mind. Any artifice of politicians may assist nature in the producing of those sentiments, which she suggests to us, and may even on some occasions, produce alone an approbation or esteem for any particular action; but it is impossible it should be the sole cause of the distinction we make betwixt vice and virtue. If you assert, that vice and virtue consist in relations susceptible of certainty and demonstration, you must confine yourself to those four relations, which alone admit of that degree of evidence; and in that case you run into absurdities, from which you will never be able to extricate yourself.