A little reflection will show that humbug is an astonishingly wide-spread phenomenon — in fact almost universal. And this is true, although we exclude crimes and arrant swindles from the definition of it, according to the somewhat careful explanation which is given in the beginning of the chapter succeeding this one. The Humbugs of the World (1865)
But however mysterious is nature, however ignorant the doctor, however imperfect the present state of physical science, the patronage and the success of quacks and quackeries are infinitely more wonderful than those of honest and laborious men of science and their careful experiments. The Humbugs of the World (1865)