Abstract: The Metaphysics of Theism presents an explanation and evaluation of Aquinas's natural theology, the paradigm of which is the first book of the Summa contra gentiles. Natural theology provides the traditional and still central means of integrating philosophy with (some of) theology. What makes this enterprise natural theology is its forgoing of appeals to revelation as evidence for the truth of propositions. What makes it natural theology is its agenda to investigate, by means of analysis and argument, not only the existence and nature of God but also the relation of everything else—especially human nature and behaviour—to God, considered as reality's first principle. Natural theology still offers the best route by which philosophers can, as philosophers, approach theological propositions. The one presented in this book undertakes to show that there must be a necessary being that constitutes the ultimate explanation of the universe.

Keywords: Aquinas, cosmology, faith, God, God's existence, God's nature, metaphysics, natural theology, necessary being, Norman Kretzmann, philosophy of religion, Summa contra gentiles, theism, ultimate explanation of universe