You ought to speak of other States in the plural number; not one of them is a city, but many cities, as they say in the game. For indeed any city, however small, is in fact divided into two, one the city of the poor, the other of the rich; these are at war with one another; and in, either there are many smaller divisions, and you would be altogether beside the mark if you treated them all as a single State. [Plato, The Republic (Jowett translation), Book IV: 422.]