Patrick Boyde brings Dante's thought and poetry into focus for the modern reader by restoring the Comedy to its intellectual and literary context in 1300. He begins by describing the authorities that Dante acknowledged in the field of ethics and the modes of thought he shared with the great thinkers of his time. Boyde concentrates on the poetic representation of the most important vices and virtues in the Comedy. He stresses the heterogeneity and originality of Dante's treatment, and the challenges posed by his desire to harmonize these divergent value systems.