What is the relation between commonsensical knowledge and philosophical theory in Hume’s philosophy ? From Humes’s point of view, improper philosophical analyses of common sense are rooted in an oversimplified and too narrow picture of human nature in which man is described chiefly on the theoretical field as subject of cognition. Hume brings into question the very idea of separation vita contemplativa, cognitive relation to the world, and stresses the primacy of human practice. The role of scientific or, better, philosophical language is to give the proper description of experience, in abandoning the substantial standpoint and accepting functional one.