Quack: A boastful pretender to arts which he does not understand. A vain boastful pretender to physick; An artful, tricking practitioner in physick.
Samuel JohnsonNever, my dear Sir, do you take it into your head that I do not love you; you may settle yourself in full confidence both of my love and my esteem; I love you as a kind man, I value you as a worthy man, and hope in time to reverence you as a man of exemplary piety.
Samuel JohnsonIt is wonderful what a difference learning makes upon people even in the common intercourse of life, which does not appear to be much connected with it.
Samuel Johnson