The standard textbook of theology in medieval universities was the Sentences by Peter Lombard (1095-1160), bishop of Paris. This collection systematically arranged the theological judgments of Scripture and the Church Fathers on various topics. For almost four centuries, those seeking higher credentials in theology had to study, teach, and comment on Lombard's Sentences. It was formative for the likes of St. Thomas Aquinas and St. Bonaventure. Over time, the genre of commentaries on the Sentences became its own vehicle for new developments in theology. The Sentences was not replaced by Aquinas's Summa as a standard textbook until the 16th century.

Philosopher Philipp Rosemann has written two books on the Sentences and its significance for the development of theology. The first, Peter Lombard (2004), is about Lombard and his book. The second, The Story of a Great Medieval Book: Peter Lombard's "Sentences" (2007), is about the commentary tradition on the Sentences. Rosemann gives fascinating insights into the development as theology as a systematic science, which had profound ramifications for Catholic spiritual life and the history of the West.

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