Plato offers two main analogies to examine the definition of justice. The division of parts in the soul as well as the parts of the state. Both of the parts have some similar things. Plato claims that the justice is the same in the soul and in the state. In the analogy of the state Plato supports the definition of justice as “doing one’s own work”. It becomes obvious that in order for justice to remain in the state each person has to do his own work and not meddle with others.
In his history of justice, Plato defines in the two ways. Supporting those definitions by the parts in the state and the soul and their interaction. The way justice should be is shown clearly both in the state and in the soul and then comes the claim regarding the philosopher’s king which is the only combination of a ruler that is fi to rule both in the sense of a just state or a just