“Incidentally, psychoanalysis is not a science: it is at best a medical process, and perhaps even more like witch-doctoring. It has a theory as to what causes disease—lots of different “spirits,” etc. The witch doctor has a theory that a disease like malaria is caused by a spirit which comes into the air; it is not cured by shaking a snake over it, but quinine does help malaria. So, if you are sick, I would advise that you go to the witch doctor because he is the man in the tribe who knows the most about the disease; on the other hand, his knowledge is not science. Psychoanalysis has not been checked carefully by experiment.”

— Richard Feynman

volume I; lecture 3, "The Relation of Physics to Other Sciences"; section 3-6, "Psychology"; p. 3-8
The Feynman Lectures on Physics (1964)

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Richard Feynman 181

American theoretical physicist 1918–1988

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“It's a great game to try to look at the past, at an unscientific era, look at something there, and say have we got the same thing now, and where is it? So I would like to amuse myself with this game. First, we take witch doctors. The witch doctor says he knows how to cure. There are spirits inside which are trying to get out. … Put a snakeskin on and take quinine from the bark of a tree. The quinine works. He doesn't know he's got the wrong theory of what happens. If I'm in the tribe and I'm sick, I go to the witch doctor. He knows more about it than anyone else. But I keep trying to tell him he doesn't know what he's doing and that someday when people investigate the thing freely and get free of all his complicated ideas they'll learn much better ways of doing it. Who are the witch doctors? Psychoanalysts and psychiatrists, of course.”

Richard Feynman book The Meaning of It All

lecture III: "This Unscientific Age"
David Goodstein reports http://www.americanscientist.org/bookshelf/pub/feynmaniacs-should-read-this-review-skip-lecture-collection-save-22-simoleons that the entire psychology department walked out in a huff at this point.
The Meaning of It All (1999)

“The earliest authority was the word of the strongest warrior, the head of the family or the tribe, the medicine man or the witch doctor.”

Kirby Page (1890–1957) American clergyman

Source: Something More, A Consideration of the Vast, Undeveloped Resources of Life (1920), p. 28

“My dream when I was a child was to be a medical doctor so that I could help people suffering from diseases.”

Chiaki Mukai (1952) astronaut, medical doctor

“Once upon a time, the founder of Protestant Christianity, said that doctors were fools, for treating diseases, as if they came from material causes. Then, Louis Pasteur disproved that, and came up with something, gonna love this, he called it "Germ Theory." Germs are still a theory! Atomic Theory is still a theory. Theory of gravity has never been proved.”

Aron Ra (1962) Aron Ra is an atheist activist and the host of the Ra-Men Podcast

Youtube, Other, Reason Rally Ra Rant https://www.youtube.com/watch?v=isrST6wOUJA (March 28, 2012)

“Doctors are men who prescribe medicine of which they know little, to cure diseases of which they know less, for human beings of which they know nothing.”

Voltaire (1694–1778) French writer, historian, and philosopher

Les médecins administrent des médicaments dont ils savent très peu, à des malades dont ils savent moins, pour guérir des maladies dont ils ne savent rien.
This attribution to Voltaire appears in Strauss' Familiar Medical Quotations (1968), p. 394, and in publications as early as 1956 http://books.google.pt/books?id=lCtCAQAAIAAJ&q=%22Doctors+are+men+who+prescribe+medicine+of%22&dq=%22Doctors+are+men+who+prescribe+medicine+of%22&hl=pt-PT&sa=X&ei=mbnWUsvDIfTB7Aaw_YD4Dw&redir_esc=y; the quotation in French does not, however, appear to be original, and is probably a relatively modern invention, only quoted in recent (21st century) published works, which attribute it to "Voltaire" without citing any source.
Attributed

“Doctors are men who prescribe medicines of which they know little, to cure diseases of which they know less, in human beings of whom they know nothing.”

Voltaire (1694–1778) French writer, historian, and philosopher

This attribution to Voltaire appears in Strauss' Familiar Medical Quotations (1968), p. 394, and in publications as early as 1956 http://books.google.pt/books?id=lCtCAQAAIAAJ&q=%22Doctors+are+men+who+prescribe+medicine+of%22&dq=%22Doctors+are+men+who+prescribe+medicine+of%22&hl=pt-PT&sa=X&ei=mbnWUsvDIfTB7Aaw_YD4Dw&redir_esc=y; the quotation in French does not, however, appear to be original, and is probably a relatively modern invention, only quoted in recent (21st century) published works, which attribute it to "Voltaire" without citing any source.
Original: (fr) Les médecins administrent des médicaments dont ils savent très peu, à des malades dont ils savent moins, pour guérir des maladies dont ils ne savent rien.

“High among the costs of immigration is the appearance among us of diseases that never before afflicted us and the sudden reappearance of contagious diseases that researchers and doctors had eradicated long ago. Malaria, polio, hepatitis, tuberculosis and such rarities of the Third World as dengue fever, Chagas' Disease and leprosy are surfacing here…”

Patrick Buchanan (1938) American politician and commentator

2000s, State of Emergency (2006)

“I'm not unmindful of man's seeming need for faith; I'm for anything that gets you through the night, be it prayer, tranquilizers, or a bottle of Jack Daniel's. But to me religion is a deeply personal thing in which man and God go it alone together, without the witch doctor in the middle.”

Frank Sinatra (1915–1998) American singer and film actor

Also quoted in Frank Sinatra, My Father (1986) by Nancy Sinatra, p. 201.
Playboy interview (1963)

“The doctor of the future will give no medicine, but will instruct his patient in the care of the human frame, in diet and in the cause and prevention of disease.”

Thomas Edison (1847–1931) American inventor and businessman

This has been reprinted many times with slight variations on the wording; it is part of a much larger quote directly from Edison published in 1903:
:Nineteen hundred and three will bring great advances in surgery, in the study of bacteria, in the knowledge of the cause and prevention of disease. Medicine is played out. Every new discovery of bacteria shows us all the more convincingly that we have been wrong and that the million tons of stuff we have taken was all useless.
The doctor of the future will give no medicine, but will instruct his patient in the care of the human frame, in diet and in the cause and prevention of disease.
They may even discover the germ of old age. I don't predict it, but it might be by the sacrifice of animal life human life could be prolonged.
Surgery, diet, antiseptics — these three are the vital things of the future in preserving the health of humanity. There were never so many able, active minds at work on the problems of diseases as now, and all their discoveries are tending to the simple truth — that you can't improve on nature.
:* As quoted in "Wizard Edison" in The Newark Advocate (2 January 1903), p. 1 according to research by Barbara and David P. Mikkelson at snopes.com http://www.snopes.com/quotes/edison.asp.
1900s

“Doctors! You know yourself, without the help of any doctors that your case has no foundation! I care not a straw for your Doctors! For every Doctor and Lawyer that upholds your case I could find a thousand that would find our marriage good and valid!”

Catherine of Aragon (1485–1536) first wife of Henry VIII of England (1485–1536)

Alison Weir (1991). The Six Wives of Henry VIII. ISBN 0802136834, p. 213.

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Richard Feynman 181

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