The lecture focuses on a traditional commonplace concerning the value of knowledge. A medieval lyrical debate on what is best to have between wealth or knowledge will introduce to a different narrative perspective, based on which it looks also possible to easily convert knowledge into money (selling the books in which said knowledge is textually encoded), and then waste it entirely, indulging in sinful habits. The discussed literary works will mainly be a provençal partimen, Guillem, prims iest en trobar a ma guiza (BdT 205,4), and the French narrative presented as Le département des livres in ms. Paris, BNF, 837.