Plato in his "Republic" argues that it is the aim of Individual Man as of the State to be wise, brave and temperate. In a State, he says, there are three orders, the Guardians, the Auxiliaries, the Producers. Wisdom should be the special virtue of the Guardians; Courage of the Auxiliaries; and Temperance of all. These three virtues belong respectively to the Individual Man, Wisdom to his Rational part; Courage to his Spirited; and Temperance to his Appetitive: while in the State as in the Man it is Injustice that disturbs their harmony. Because the character of Man appears in the State unchanged, but in a larger form, Plato represented Socrates as studying the ideal man himself through an Ideal Commonwealth. In another of his dialogues, "Critias," of which we have only the beginning, Socrates wishes that he could see how such a commonwealth would work, if it were set moving. Critias undertakes to tell him. For he has received tradition of events that happened more than nine thousand years ago, when the Athenians themselves were such ideal citizens. Critias has received this tradition, he says, from a ninety-year-old grandfather, whose father, Dropides, was the friend of Solon. Solon, lawgiver and poet, had heard it from the priests of the goddess Neïth or Athene at Sais, and had begun to shape it into a heroic poem. This was the tradition:--Nine thousand years before the time of Solon, the goddess Athene, who was worshipped also in Sais, had given to her Athenians a healthy climate, a fertile soil, and temperate people strong in wisdom and courage. Their Republic was like that which Socrates imagined, and it had to bear the shock of a great invasion by the people of the vast island Atlantis. This island, larger than all Libya and Asia put together, was once in the sea westward beyond the Atlantic waves,--thus America was dreamed of long before it was discovered. Atlantis had ten kings, descended from ten sons of Poseidon (Neptune), who was the god magnificently worshipped by its people. Vast power and dominion, that extended through all Libya as far as Egypt, and over a part of Europe, caused the Atlantid kings to grow ambitious and unjust. Then they entered the Mediterranean and fell upon Athens with enormous force. But in the little band of citizens, temperate, brave, and wise, there were forces of Reason able to resist and overcome brute strength. Now, however, gone are the Atlantids, gone are the old virtues of Athens. Earthquakes and deluges laid waste the world. The whole great island of Atlantis, with its people and its wealth, sank to the bottom of the ocean. The ideal warriors of Athens, in one day and night, were swallowed by an earthquake, and were to be seen no more.