Aquinas's Moral Theory: Essays in Honor of Norman Kretzmann (review)

Although medieval philosophy generally hasn't received much attention from Anglo-American philosophers in the last few centuries, the philosophy of Thomas Aquinas has long been the exception to that rule. In one sense, then, the collection of essays in Aquinas's Moral Theory fits into a long-standing and rich tradition of critical analysis and thoughtful reconstruction. In another sense, however, the book treads ground that is, if not entirely new, then at least not well worn. Most treatments of Aquinas's ethics discuss it in separation from the rest of his work. Aquinas himself, however, sees his moral theory as intrinsically tied up with other aspects of his philosophical system, such as his metaphysics and his philosophical theology. Aquinas's Moral Theory argues that fully understanding Aquinas's ethics, then, requires attention to the way in which "his interests in moral issues often flow into and inform and shape his work in other areas, just as his moral reflections are shaped and grounded by them" (3).

MacDonald and Stump have drawn together a group of ten essays by respected scholars in medieval philosophy—essays written with the explicit intent of examining Aquinas's moral theory both in its own right and in light of Aquinas's broader philosophical system. Not surprisingly, the papers in the book range over a wide number of philosophical and theological topics. Moreover, they explore connections not only within Aquinas's work, but between Aquinas and Aristotle, between Aquinas and his contemporaries, and between Aquinas's thought and problems in contemporary philosophy. It's useful, then, that the papers are grouped under three main headings: Moral Theory and Moral Theology, Moral Psychology and Practical Reason, and Moral Theory in Philosophy of Language and Metaphysics.

Perhaps the most striking feature of this particular collection of essays is the diversity of scholarship it represents. Although the ten essays contribute to the same larger project, the individual authors use at least three distinct approaches in accomplishing that goal: for example, Anthony Kenny ("Aquinas on Aristotelian Happiness") and Mark Jordan ("Ideals of Scientia Moralis and the Invention of the Summa theologiae") examine motivations for some of the distinctive innovations in Aquinas's moral thought. By contrast, the essays by Jan Aertsen ("Thomas Aquinas on the Good: The Relation between Metaphysics and Ethics"), E. J. Ashworth ("Aquinas on Significant Utterance: Interjection, Blasphemy, Prayer"), John Boler ("Aquinas on Exceptions in Natural Law"), and Paul Spade ("Degrees of Being, Degrees of Goodness: Aquinas on Levels of Reality") seek primarily to raise or resolve difficulties within Aquinas's philosophical system. Finally, Peter King ("Aquinas on the Passions"), Scott MacDonald ("Practical Reasoning and Reasons-Explanations: Aquinas's Account of Reason's Role in Action"), Gareth Matthews ("Saint Thomas and the Principle of Double Effect"), and Eleonore Stump ("Wisdom: Will, Belief, and Moral Goodness") consider what light Aquinas has to shed on issues of particular interest to contemporary philosophers.

The rich variety of viewpoints and interpretations that constitute one of the main strengths of this volume also constitutes one of its main weaknesses, however. The difference between the approaches of, say, Stump, Jordan, and Aertsen are almost dizzying. So the collection of essays doesn't yield a unified picture of Aquinas's moral theory; readers looking for an introduction to Aquinas's ethics or for a comprehensive overview of its relation to his broader metaphysical system will be disappointed. In particular, the papers in the section devoted to moral theory in philosophy of language and metaphysics raise more questions than they answer; the reader is left wondering what further consequences the provocative claims made there have for Aquinas's ethics.

Still, this represents not as much a flaw in the book itself as it does a conscious call to further scholarship. As Aertsen and Spade both remark...