Alone among Thomas Aquinas' works, the Summa Theologiae contains well-developed and integrated discussions of metaphysics, ethics, law, human action, and the divine nature. The essays in this volume, by scholars representing varied approaches to the study of Aquinas, offer thorough, cutting-edge expositions and analyses of these topics and show how they relate to Aquinas' larger system of thought. The volume also examines the reception of the Summa Theologiae from the thirteenth century to the present day, showing how scholars have understood and misunderstood this key text - and how, even after seven centuries of interpretation, we still have much to learn from it. Detailed and accessible, this book will be highly important for scholars and students of medieval philosophy and theology.