Thomas Aquinas ranks among the most important of Western philosophers; certainly, few philosophersor theologians had as much influence on the medieval period as he did. He played a significant role in bringing the philosophy of Aristotle into harmony with medieval philosophy and theology in the Latin West. His own original contributions to virtually every area of philosophy and theology shaped much of medieval thought after him, and they continue to be influential today.

In this extensive and deeply researched study, Eleonore Stump explores the full range of Aquinas's writings. She presents and assesses the vast range of Aquinas's thought, including his metaphysics and theology, philosophy of mind, philosophical psychology, epistemology, ethics and political theory, and philosophy of religion. In the process, she brings Aquinas' thought into dialogue with current discussions in contemporary philosophy in ways that illuminate both the Thomistic and the contemporary positions.