The oldest book found, written nearly 2,5 thousand years ago, contains ideas that are still relevant today. The book discusses justice and how it is important to mind one's own business and play our appropriate role to benefit ourselves and society. Society and souls are divided into three parts, and every person has all three parts, but some prevail. The book also talks about the life cycle of cities and how they cycle from aristocracy to tyranny and back. The appropriate roles of individuals are shaped by the need of the city and individual's skills. In a just city, the city's need and individual's needs work symbiotically.