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Click on the phrases to see them in context. The original texts by Immanuel Kant and David Hume are available from the Gutenberg Projet.
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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 very essence of virtue, according to this hypothesis, is to produce pleasure and that of vice to give pain. But no proposition can be more evident, than that property is perfectly unintelligible without first supposing justice and injustice; and that these virtues and vices are as unintelligible, unless we have motives, independent of the morality, to impel us to just actions, and deter us from unjust ones. But to make the matter still more certain, I alter the object; and instead of vice and virtue, make the trial upon beauty and deformity, riches and poverty, power and servitude. - If belief consisted only in a certain vivacity, conveyed from an original impression, it would decay by the length of the transition, and must at last be utterly extinguished: And vice versa, if belief on some occasions be not capable of such an extinction; it must be something different from that vivacity.
For whether the passion of self-interest be esteemed vicious or virtuous, it is all a case; since itself alone restrains it: So that if it be virtuous, men become social by their virtue; if vicious, their vice has the same effect.