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“The prudent man always studies seriously and earnestly to understand whatever he professes to understand, and not merely to persuade other people that he understands it; and though his talents may not always be very brilliant, they are always perfectly genuine. He neither endeavours to impose upon you by the cunning devices of an artful impostor, nor by the arrogant airs of an assuming pedant, nor by the confident assertions of a superficial and imprudent pretender. He is not ostentatious even of the abilities which he really possesses. His conversation is simple and modest, and he is averse to all the quackish arts by which other people so frequently thrust themselves into public notice and reputation.”
― Adam Smith, The Theory of Moral Sentiments

“Laws should be made, not against quacks but against superstition.”
― Rudolf Ludwig Karl Virchow

“Pulling bad science apart is the best teaching gimmick I know for explaining how good science really works.”
― Ben Goldacre, I Think You'll Find It's a Bit More Complicated Than That

“As for quackery and mountebanks, of which the town was so full, I listened to none of them, and have observed often since, with some wonder, that for two years after the plague I scarcely saw or heard of one of them about town. Some fancied they were all swept away in the infection to a man, and were for calling it a particular mark of God’s vengeance upon them for leading the poor people into the pit of destruction, merely for the lice of a little money they got by them; but I cannot go that length neither. That abundance of them died is certain; many of them came within the reach of my own knowledge; but that all of them were swept off I much question. I believe rather they fled into the country, and tried their practices upon the people there, who were in apprehension of the infection before it came among them.”
― Daniel Defoe, A Journal of the Plague Year