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The word “justice,” as still used in the law, is more similar to Plato’s conception than it is as used in political speculation. Under the influence of democratic theory, we have come to associate justice with equality, while for Plato it has no such implication. “Justice,” in the sense in which it is almost synonymous with “law”—as when we speak of “courts of justice”—is concerned mainly with property rights, which have nothing to do with equality. The first suggested definition of “justice,” at the beginning of the Republic, is that it consists in paying debts. This definition is soon abandoned as inadequate, but something of it remains at the end. There are several points to be noted about Plato’s definition. First, it makes it possible to have inequalities of power and privilege without injustice. The guardians are to have all the power, because they are the wisest members of the community; injustice would only occur, on Plato’s definition, if there were men in the other classes who were wiser than some of the guardians. That is why Plato provides for promotion and degradation of citizens, although he thinks that the double advantage of birth and education will, in most cases, make the children of guardians superior to the children of others. If there were a more exact science of government, and more certainty of men following its precepts, there would be much to be said for Plato’s system. No one thinks it unjust to put the best men into a football team, although they acquire thereby a great superiority. If football were managed as democratically as the Athenian government, the students to play for their university would be chosen by lot. But in matters of government it is difficult to know who has the most skill, and very far from certain that a politician will use his skill in the public interest rather than in his own or in that of his class or party or creed.
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Bertrand Russell (A History of Western Philosophy: And Its Connection with Political and Social Circumstances from the Earliest Times to the Present Day)