There can be no doubt that where faith is very strong, and imagination is lively, cures which seem to border on the miraculous are often effected—and this is, indeed, the basis of all miracle as applied to relieving bodily afflictions. All of this may be, if not as yet fully explained by physiology, at least shown to probably rest on a material basis. But no sound system of cure can be founded on it, because there is never any certainty, especially for difficult and serious disorders, that they can ever be healed twice in succession. The "faith" exacted is sometimes a purely hereditary gift, at other times merely a form of blind ignorance and credulity. It may vividly influence all the body, and it may fail to act altogether. But the "Faith Healer" and "Christian Scientist," or "Metaphysical Doctor," push boldly on, and when they here and there heal a patient once, it is published to the four winds as a proof of invariable infallibility. And as everybody believes that he has "faith," so he hopes to be cured. In popular custom for a man to say he believes in anything, and to be sure that he really has nothing against it, constitutes as much "faith" as most men understand. A man may be utterly destitute of any moral principle and yet live in a constant state of "faith" and pious conviction. Here the capacity for cure by means of charms is complete.
-- Charles Godfrey Leland