"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."

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Providence has fixed the limits of human enjoyment by immovable boundaries, and has set different gratifications at such a distance from each other, that no art or power can bring them together. This great law it is the business of every rational being to understand, that life may not pass away in an attempt to make contradictions consistent, to combine opposite qualities, and to unite things which the nature of their being must always keep asunder.

— Samuel Johnson