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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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Besides, the commerce of mankind is not confined to the barter of commodities, but may extend to services and actions, which we may exchange to our mutual interest and advantage.

 Suppose, that two persons of the same trade should seek employment in a town, that is not able to maintain both, it is plain the success of one is perfectly incompatible with that of the other, and that whatever is for the interest of either is contrary to that of his rival, and so vice versa. 
  • Nothing can be more real, or concern us more, than our own sentiments of pleasure and uneasiness; and if these be favourable to virtue, and unfavourable to vice, no more can be requisite to the regulation of our conduct and behaviour.
 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. If this be allowed with respect to extension and number, we can make no difficulty with respect to virtue and vice, wit and folly, riches and poverty, happiness and misery, and other objects of that kind, which are always attended with an evident emotion. But as authors do not commonly use this precaution, I shall presume to recommend it to the readers; and am persuaded, that this small attention would subvert all the vulgar systems of morality, and let us see, that the distinction of vice and virtue is not founded merely on the relations of objects, nor is perceived by reason. The uneasiness and satisfaction are not only inseparable from vice and virtue, but constitute their very nature and essence.