Il "Contra Judaeos" di Alano delle Isole (Alano di Lilla). La ratio della fides universale nel confronto con la religione ebraica

Written by Alanus ab Insulis during his long permanence in Languedoc, in the years of his intellectual maturity, the De fide catholica consists of four books, aiming at refuting the heresies then spreading in southern France (especially Catharism), together with Islām and, in the third book, Judaism. In the prologue, a key part of the treaty, Alan recalls the main tenets of his philosophy, such as are found in his other major works (Summa ‘Quoniam homines’, Anticlaudianus, Regule celestis iuris), defining the scope and the meaning of ratio. On these intellectual foundations, he embarks in the confutation of Judaism’s objections against Christianism, which he sees not as irrational accusations, but as a devious misunderstanding of ratio: in this way, he reaffirms Christianism as the only rational faith, universal in its reaching and capable of truly metaphysical arguments.