Fr. Servais Pinckaers’s work is well on its way to being accepted as the work on Catholic moral thinking for the coming generation of laymen and students. Pinckaers sharply distinguishes this view of morality from modern “moralities of obligation,” which regard the moral life primarily as obedience to rules that limit human freedom and curb human desires. Pinckaers sees moralities of obligation as the logical outcome of a new understanding of human freedom. Instead of regarding freedom as the capacity to engage in excellent acts of virtue (freedom for excellence), the modern view understands freedom as the radical ability to do good or evil indifferently (freedom of indifference). Pinckaers argues convincingly that this view of freedom and the morality of obligation that flows from it have impoverished the Catholic understanding of the moral life. This work offers the reader a compelling itinerary of moral development, rooted in the theology of St. Paul and the morality of the Gospels. Paper.