They rarely apply themselves to subjects that might be useful in the conduct of life, for this seems too common to them; what they seek is not to be useful either to others or to themselves, but only to be esteemed as learned; they do not offer arguments in support of the things that they advance, or, if they do offer them, they are mysterious and incomprehensible arguments that neither they nor anyone else can conceive with clarity; they have no clear arguments; but if they did, they would not state them.