On the Genealogy of Morals (1887) is a book about the history of ethics and about interpretation. Nietzsche rewrites the former as a history of cruelty, exposing the central values of the Judaeo-Christian and liberal traditions – compassion, equality, justice – as the product of a brutal process of conditioning designed to domesticate the animal vitality of earlier cultures. The result is a book which raises profoundly disquieting issues about the violence of both ethics and interpretation. Nietzsche questions moral certainties by showing that religion and science have no claim to absolute truth, before turning on his own arguments in order to call their very presuppositions into question. The Genealogy is the most sustained of Nietzsche’s later works and offers one of the fullest expressions of his characteristic concerns.