This book explores how the great sixteenth- and early-seventeenth-century Jesuits read the secunda pars of the Summa theologiae. Their interpretation of Aquinas's moral theology is shaped in part by their historical context, including the impact of the Protestant Reformation and the European discovery of the "New World," as well as new trade routes with Asia. The essays in this volume explore a wide variety of topics, including the natural desire to see God, infused moral virtues, freedom of conscience, faith and justification, doctrinal development, just war, slavery, the virtue of religion, Eucharistic sacrifice, sexual ethics, the theology of vocation, and natural law. The essays engage the thought of Francisco Suarez, Gabriel Vazquez, Luis de Molina, Francisco de Toledo, and various others. The underlying argument of the book is that this erudite, deeply Catholic and broadly Thomistic approach to ethics should be retrieved, given its Christian seriousness. Guided by divine revelation as taught in Scripture and Tradition, moral theologians in the Jesuit tradition ground themselves in Aquinas and in a rich understanding of natural law, universal moral norms, and the virtues, as well as in appreciation for spiritual interiority, conscience, and discernment.