In the fourth part of Plato's "Republic", Socrates defines individual justice as well as state justice. I explained the definition of Socrates' s personal justice, then Socrates shows that he can not prove the correct definition of justice and raises further questions about justice. I assert that if we act according to this justice definition, we do not know when to take action. Since the meaning of justice and the meaning of good judgment are not included in the definition, people may act unfairly according to the definition of justice.
In Plato's work "Republic" there is a question as to whether the existence exists systematically. Because the Republic itself is an attempt to answer questions about human behavior, that is justice. In order to solve the problem of justice, Plato considers the relationship between the ideal city state, the autonomous collective unit, and the realization of the structure and justice of the republic. Plato thinks that the philosopher's king ought to be the ruler, as all philosophers are trying to find an ideal city state. "Calipolis" or a beautiful city is a legitimate city, political control depends on knowledge, the philosopher's king owns not power but power. In theory, it would be ideal if republics and modern states were dominated by knowledge rather than power, power is extremely important in the composition of political activities. This is a flaw in the discussion of Plato, which will be discussed in this paper. At the same time, some features of contemporary countries are consistent with an ideal city city that is inevitable.
Let's start from Plato Republic where we started. The first starting point of political philosophy may be a republic. Plato's theory of justice and thought represents the political and ideological paradigm of the next century. In his masterpiece, Plato shows that there is an important relationship between political life and the ideal form of intangible realm. Plato's city state is a physical expression of the permanent form of justice that exists in this invisible field. In other words, Plato has a metaphysical paradigm with a political system. Likewise, there is a metaphysical justice paradigm which is a locus of justice that determines the shapes of justice cities and individuals of justice. According to Plato, the function and purpose of the ideal ruler philosopher king is to shape and rule the city according to the form of justice.