When a man puts on a character he is a stranger to, there is as much difference between what he appears and what he is in reality as there is between a visor and a face.
Nothing more strikingly betrays the credulity of mankind than medicine. Quackery is a thing universal, and universally successful. In this case it becomes literally true that no imposition is too great for the credulity of men.
To elevate and surprise is the great art of quackery and puffing; to raise a lively and exaggerated image in the mind, and take it by surprise before it can recover breath.
Heroes have gone out; quacks have come in; the reign of quacks has not ended with the nineteenth century. The sceptre is held with a firmer grasp; the empire has a wider boundary. We are all the slaves of quackery in one shape or another. Indeed, one portion of our being is always playing the successful quack to the other.