Socrates has at last provided a definition of justice. This definition bears strong resemblance to the two definitions of justice put forward in Book I. Cephalus ventured that justice was the honoring of legal obligations, while his son Polemarchus suggested that justice amounts to helping one’s friends and harming one’s enemies. These two definitions are linked by the imperative of rendering what is due, or giving to each what is appropriate. This same imperative finds variant expression in Plato’s definition of justice—justice as a political arrangement in which each person plays the appropriate role. What is due to each person is rendered all at once. Each is assigned the role in society that best suits their nature and that best serves society as a whole.
There are many images in this speech that make it come to life. His use of metaphor helps the reader to get a better picture of the king’s state. For example, “nature's soft nurse” is used in describing sleep as a natural cure for troubles. When one sleeps he can forget the problems and worries of the day and have a peaceful time. He also compares sleep to a dull god. He says this because at this point, since he can’t sleep, he does see it as a god. Sleep is described as dull because nothing happens during sleep; therefore, it is dull. The King describes the hard, uncomfortable beds his subjects sleep on “loathsome beds.” These two descriptions help to clarify that there is a big gap between the rich and the poor in the King’s country. This is the reason he wants sleep. Such words are “lull’d”, “melody”, and “hushed." These just show how much the King wants sleep.