Thrasymachos was not convinced . He offered a new argument that ``the most perfect injustice .makes the unjust man most happy ' and ``injustice when it is grand enough is mightier than justice , more generous , more masterly (pp . 142-43 . Socrates overturned Thrasymachos ' claim that ``injustice is a virtue and justice is a vice (p . 150 . Socrates attacked the proposition that ``injustice was both stronger and more powerful than justice (p . 151 , by showing the just ``to be wiser and better and more...











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