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From Thomas Hobbes, On the Citizen, edited and translated by Richard Tuck and Michael Silverthorne (Cambridge University Press, 1998), 3-5. This is a new translation by Silverthorne that replaces the English translation of 1651, which the editors insist was unauthorized by Hobbes. The older translation, in a key passage, held that "were the nature of human actions as distinctly known as the nature of quantity in geometrical figures, the strength of avarice and ambition, which is sustained by the erroneous opinions of the vulgar as touching the nature of right and wrong, would presently faint and languish; and mankind should enjoy such an immortal peace, that unless it were for habitation, on supposition that the earth would grow too narrow for her inhabitants, there would hardly be left any pretence for war."
Portrait of Hobbes from Wikipedia.