the most significant work in ethics since Sidgwick's masterpiece was published in 1873 ... a work of epic proportions and ambitions Peter Singer, Times Literary Supplement the most eagerly awaited book in philosophy since Ludwig Wittgenstein's Philosophical Investigations... Should the book become as influential as the stars guiding its arrival suggest, it could seriously alter the way that ethics is thought about and taught. Constantine Sandis, Times Higher Education represents many years of work by one of the most influential philosophers of our time Simon Blackburn, Financial Times an epochal work... a remarkable achievement, giving us a truly comprehensive picture of the moral outlook - both normative and metaethical - of one of the greatest moral thinkers of our time Mark Schroeder, Notre Dame Philosophical Reviews