sentences:  He is the author of several works, including a "Summa" devoted to questions of canon law and ethics and dealing at length with the question of usury.His interference in the affairs of the University of Paris, in the midst of the confusion arising from the introduction of the Arabian translations of Aristotle, resulted in the proscription (1215) of the metaphysical as well as the physical treatises of the Stagyrita, together with the summaries thereof ("Summæ de eiusdem").At the same time, his rescript (Denifle, "Chartul.