Among the great works of Thomas Aquinas, the Commentary on the Sentences of Peter Lombard has suffered almost total neglect among translators. Such neglect is surprising, considering that the massive Commentarymore than 4,000 pages in the last printed editionis not only Aquinass first systematic engagement with all the philosophical and theological topics on which he expended his energy over the span of a short career but is also characterized by an exuberance and elaborateness seldom found in his subsequent writings. Although Chenu had already drawn attention decades ago to the importance of...