Natural Law, whether grounded in human reason or divine edict, is an unwritten form of law which encourages people to follow virtue and shun vice. The concept dominated Renaissance thought, where its literary equivalent, poetic justice, underpinned much of the period's creative writing. R. S. White's study examines a wide range of Renaissance texts, by More, Spenser, Sidney, Shakespeare and Milton, in the light of these developing ideas of Natural Law. It shows how writers as radically different as Aquinas and Hobbes formulated versions of Natural Law which served to maintain socially established hierarchies. For Aquinas, Natural Law always resided.