Dalla 'pagina' alla 'scientia'. L'identificazione tra libri e sapere scientifico nel Medioevo scolastico e il caso anomalo della teologia

The official documents of the Parisian Faculty of Arts (starting from the Statute of March 1255) show a close identification between the philosophical sciences and the corresponding textbooks: to learn a particular science means essentially to read certain, prescribed books. The case of theology seems to be different, however. In spite of the fact that the Bible served as a paradigm for the ‘textualization’ of all kinds of knowledge, and even of the whole world, it did not fit perfectly the epistemological criteria which Aristotle’s Posterior analytics established as necessary for every science. Already in the second half of the 13th century, both Thomas Aquinas and Henry of Ghent tried to construct theology as a science, in the Aristotelean sense, by appealing respectively to the theory of the subalternation of the sciences and to the doctrine of the lumen medium. The different reactions to these two models by Godfrey of Fontaines, Durandus of Saint-Pourçain and Peter Auriol seem to indicate a process in which theology can constitute itself as a true science only through a broadening of its textual basis, outside the scope of Sacred Scripture.