every man praises or decries according to his mind, always clothing vice with the name of its kindred virtue, or virtue with the name of its kindred vice; for example, calling an impudent man frank, a modest man dull, an ignorant man good, a knave discreet, and so in all things else. Yet I believe that there exists in everything its own perfection, altho concealed; and that this can be determined through rational discussion by any having knowledge of the thing in hand."