Vincent's Speculum Maius (The Great Mirror), the compendium of all of the knowledge of the Middle Ages, seems to have consisted of three parts, the Speculum Naturale, Speculum Doctrinale and Speculum Historiale. All the printed editions, however, include a fourth part, the Speculum Morale, added in the 14th century and mainly compiled from Thomas Aquinas, Stephen de Bourbon, and a few other contemporary writers.
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