Although he is one of the most influential Catholic theologians in Europe, very few of Klaus Demmer's writings are available in English. This translation of his well-known work on moral theology introduces Demmer's thought to English-speaking audiences. In an original synthesis of scholastic and continental philosophy, Demmer brings the Catholic moral tradition into conversation with contemporary philosophical schools - transcendental, hermeneutical, and analytical - to fashion a moral theology in the spirit of the Second Vatican Council. He shows the richness of the neoscholastic tradition in shaping and being shaped by our contemporary self-understanding. A complete bibliography of Demmer's works will assist readers in seeking out more of his writings.