Abstract

In the "ideal state chapter," Volume II began will just go for the good of the second category - its own as well, and will bring good results - after the interlocutors Gelao hole and Adi Man Plato on this map will then require a more detailed description of classification. The purpose of this paper is to Plato's definition of justice, indicating the reason why he thinks that justice itself is good, and worthy of our own reasons. I will try to prove that Plato first defined by the discussion of justice, it does suggest the value of justice itself; Secondly, discusses Plato's view of justice, appropriate response to the second volume of the interlocutors' questions . At the same time, I also want to point out Foster , Professor, in his article "Plato in the" ideal state chapter, "an error> among the improper argument . After classifying justice into the second category of "good"-it is welcomed not only for its own sake, but also for its consequences-at the beginning of the Republic book Ⅱ , Glaucon and Adeimantus then ask Plato to explain this classification more explicitly. The purpose of this paper is to discuss the definition of justice in the Republic and to explain the reason why Plato thinks that justice is itself good and worth having. I would like first to show that Plato does give an account of the value of justice itself by presenting an argument for the definition of justice, and then to demonstrate that Plato's view of justice properly answers the question proposed by his interlocutors in book Ⅱ. In so doing, I hope also to point out the inadequate argument in Prof. MB Foster's paper "A mistake of Plato's in the Republic"