For it truly is a great book, and I doubt that we will see a history of ethics similar in scope and ambition for some time to come.

Mark Eli Kalderon, Ethics

Whatever Aristotelian naturalism's fate, however, there is no doubt that Terence Irwin's treatment of it in The Development of Ethics is itself the most important development in the history of the history of ethics.

British Journal for the History of Philosophy

A remarkable work of scholarship. Very few philosophers could produce a work of such scale and such erudition. Professor Irwin has studied his chosen authors with minute precision, and has read exhaustively in the secondary literature. Sources are conscientiously recorded and ample quotations provided in footnotes. The treatment of controversial issues is always balanced, and the eventual verdicts are always judicious... This book is a monument of erudition and patience, and gives promise of similar virtues in the forthcoming successor volumes.

Anthony Kenny, Times Literary Supplement