Virtue and Vice are Moral Concepts
It appears, at first view, that men in a state of nature, having no moral relations or determinate obligations one with another, could not be either good or bad, virtuous or vicious; unless we take these terms in a physical sense, and call, in an individual, those qualities vices which may be injurious to his preservation, and those virtues which contribute to it; in which case, he would have to be accounted most virtuous, who put least check on the pure impulses of nature. But without deviating from the ordinary sense of the words, it will be proper to suspend the judgment we might be led to form on such a state, and be on our guard against our prejudices, till we have weighed the matter in the scales of impartiality, and seen whether virtues or vices preponderate among civilized men; and whether their virtues do them more good than their vices do harm; till we have discovered, whether the progress of the sciences sufficiently indemnifies them for the mischiefs they do one another, in proportion as they are better informed of the good they ought to do; or whether they would not be, on the whole, in a much happier condition if they had nothing to fear or to hope from any one, than as they are, subjected to universal dependence, and obliged to take everything from those who engage to give them nothing in return.
Jean-Jacques Rousseau, in 'Discourse on the Origin of Inequality'