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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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. Secondly, I would have anyone give me a reason, why virtue and vice may not be involuntary, as well as beauty and deformity. The virtue or vice of a son or brother not only excites love or hatred, but by a new transition, from similar causes, gives rise to pride or humility. To continue the experiment, I change anew the relation of ideas, and suppose the vice to belong to myself.