The essays in this volume explore three areas in which St. Thomas Aquinass voice has never fallen silent: sacred doctrine, the relationship of sacraments and metaphysics, and the central role of virtue in moral theology. For Aquinas, sacramental theology studies how Christ Jesus acts in the Church through created instruments, namely, the sacraments and their ministers. He remains a crucial source of wisdom for such discussions, which have profound pastoral implications. Aquinas also undertakes inquiry into human nature, human flourishing, and life in Christ. The transformation of created human capacities through the grace of the Holy Spirit requires a careful integration of philosophical and theological reflection, for which Aquinass moral theology has proven pastorally fruitful and spiritually energizing over the centuries.