Abstract: This book is a brief introduction to the thought of the great Franciscan theologian St. Bonaventure (c.1217-74). It focuses on the long-debated relation between philosophy and theology in the work of this important but neglected thinker, revealing Bonaventure as a great synthesizer. The book's exposition shows in a new and more nuanced way Bonaventure's debt to Augustine, while making clear how he was influenced by Aristotle. The book is organized according to the categories of Bonaventure's own classic text: De reductione artium ad theologiam. Part I is devoted to the definition of Christian Wisdom. In Part II, individual chapters are devoted to Bonaventure's physics, metaphysics, and moral philosophy. Part III includes chapters on the Trinity, Creation, Sin, the Incarnation, Grace, the Sacraments, and the Last Things.

Keywords: philosophy, theology, Augustine, Aristotle, Christianity, physics, metaphysics, moral philosophy, the Trinity, Creation