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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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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. Thus the course of the argument leads us to conclude, that since vice and virtue are not discoverable merely by reason, or the comparison of ideas, it must be by means of some impression or sentiment they occasion, that we are able to mark the difference betwixt them. The very essence of virtue, according to this hypothesis, is to produce pleasure and that of vice to give pain. In saying, then, that the sentiments of vice and virtue are natural in this sense, we make no very extraordinary discovery. Thus the good and bad qualities of our actions and manners constitute virtue and vice, and determine our personal character, than which nothing operates more strongly on these passions. (2) In the second place we may observe, that all kinds of vice and virtue run insensibly into each other, and may approach by such imperceptible degrees as will make it very difficult, if not absolutely impossible, to determine when the one ends, and the other begins; and from this observation we may derive a new argument for the foregoing principle. Even when the vice of inhumanity rises not to this extreme degree, our sentiments concerning it are very much influenced by reflections on the harm that results from it. 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.