QUACKS
Have nearly the same interest as knaves in concealing their ignorance and frauds, and for the most part regard with the same fear and detestation the instrument which unmasks their pretensions. This must be understood with some qualification, because the exposure of ignorance and fraud is not always sufficient to open the eyes, and enlighten the understandings, of mankind. Some perverse dupes are not to be reasoned out of their infatuation; they had rather hug the impostor, than confess the cheat; and quacks, speculating upon this infirmity of human nature, will sometimes court even an infamous notoriety.—Lancet.