An extraordinarily clear and complete synthesis of the philosophy involved in St. Thomas's understanding of the specification of human acts. Jensen delivers a compact presentation both of Thomas's thought on the topic and of the main current interpretations thereof."--Stephen L. Brock, Professor of Medieval Philosophy, Pontifical University of the Holy Cross"A significant original contribution to a currently robust conversation in contemporary ethical debates. Jensen offers a novel interpretation of Aquinas's position on how to define an act as good or bad."--Thomas A. Cavanaugh, Professor of Philosophy, University of San Francisco