Quack: A boastful pretender to arts which he does not understand. A vain boastful pretender to physick; An artful, tricking practitioner in physick.
Samuel JohnsonStand Firm for your country, and become a man Honour'd and lov'd: It were a noble life, To be found dead, embracing her.
Samuel JohnsonTo strive with difficulties, and to conquer them, is the highest human felicity; the next is, to strive, and deserve to conquer: but he whose life has passed without a contest, and who can boast neither success nor merit, can survey himself only as a useless filler of existence; ad if he is content with his own character, must owe his satisfaction to insensibility.
Samuel Johnson