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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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If any one, therefore, would assert, that justice is a natural virtue, and injustice a natural vice, he must assert, that abstracting from the nations of property, and right and obligation, a certain conduct and train of actions, in certain external relations of objects, has naturally a moral beauty or deformity, and causes an original pleasure or uneasiness. The next question is, Of what nature are these impressions, and after what manner do they operate upon us? Here we cannot remain long in suspense, but must pronounce the impression arising from virtue, to be agreeable, and that proceding from vice to be uneasy. For, first, there are other virtues and vices beside those which have this tendency to the public advantage and loss. Though we refuse to natural abilities the title of virtues, we must allow, that they procure the love and esteem of mankind; that they give a new lustre to the other virtues; and that a man possessed of them is much more intitled to our good-will and services, than one entirely void of them. The pain or pleasure, which arises from the general survey or view of any action or quality of the mind, constitutes its vice or virtue, and gives rise to our approbation or blame, which is nothing but a fainter and more imperceptible love or hatred. 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. The very essence of virtue, according to this hypothesis, is to produce pleasure and that of vice to give pain.