David Brink presents a study of T. H. Green's Prolegomena to Ethics (1883), a classic of British idealism. Green develops a perfectionist ethical theory that brings together the best elements in the ancient and modern traditions and that provides the moral foundations for Green's own influential brand of liberalism. Brink's book situates the Prolegomena in its intellectual context, examines its main themes, and explains Green's enduring significance for the history of ethics and contemporary ethical theory.