This book presents Cicero's natural law theory, including valuable definitions of the state, the ideal state, the ideal ruler, and the laws for the ideal state. Explanations are offered of the Greek sources of Cicero's republican philosophy, his influence on the Principate of Augustus, and his role in the development of modern political philosophy. As all the ages of the world have not produced a greater statesman and philosopher united than Cicero, his authority should have great weight (John Adams, 1787).