However, in Machiavelli's time, as it is today, the States whole reason for being was to serve the citizens, not vice versa. Machiavelli believed the only purpose for a ruler was to make war, and protect its citizens from attacks by other states. The ruler, therefore, is justified in doing whatever is necessary to maintain the country, even if it is unjust. Plato argues a ruler can never be unjust.
The range of Plato's knowledge was vast. He developed a deep insight into all the arts and sciences, including mathematics, physics, astronomy, politics, ethics, esthetics, poetry, painting, sculpture, and music. He remained a devoted follower of Socrates until Socrates death. He traveled extensively in Greece, southern Italy, Sicily, and even Egypt and Northern Africa.