This is an introduction to the most important theological work of the Middle Ages. In the intellectual tradition of the Christian faith, few thinkers have had a more profound effect upon both the nature of theology and the materials with which it deals than Thomas Aquinas. A knowledge, therefore, of his major work, the Summa Theologiae, is necessary for the student of theology, let alone any who are concerned with the Western intellectual tradition, so pervasive is Aquinas' thought to the fabric of Western thought. This, together with the immensity, length, and difficulty of the Summa, make a...