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
“Be careful then, patients,
and don’t accept any doctor;
die for free and do not give
a single coin to medicine.”
Y así, enfermos, ojo alerta
y ningún médico admitan;
mueran de gorra sin dar
un real a la medicina.
Diente del Parnaso ('Parnassus' Tooth') (1689), 'Prólogo al que leyere este tratado’.
Quoted in Chambers Dictionary of Quotations (1997), p. 1038.
Original
Y así, enfermos, ojo alerta y ningún médico admitan; mueran de gorra sin dar un real a la medicina.
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Related quotes
On doctors who ask patients to avoid Ayurveda, as quoted in " Doctors prescribing non-ayurvedic medicines are anti-national http://m.timesofindia.com/city/kolhapur/Doctors-prescribing-non-ayurvedic-medicines-are-anti-national/articleshow/52058067.cms", The Times of India (30 April 2016)
http://www.youtube.com/watch?v=4XWTHoMBJvk
“Any doctor should be a nutritionist… we plead for a new medicine.”
Tout médecin devrait être nutritionniste... nous plaidons pour une nouvelle médecine.
Les aliments biologiques (1982), ISBN 2-851-83000-7), p. 93-103
“From henceforth, no medicine, no doctors, no drugs of any kind shall come into this house. \”
Pledging his commitment to Faith Healing.
Page 38
The Complete Story: A New Biography on the Apostle of Faith By Julian Wilson http://books.google.co.uk/books?id=e2RWZpOHfmoC|Wigglesworth:
“Please accept my resignation. I don’t care to belong to any club that will have me as a member.”
As quoted in The Groucho Letters (1967) by Arthur Sheekman. The sentiment predates Marx by 61 years, however; it likely originated with John Galsworthy in The Forsyte Saga. In Part I, Chapter II, "Old Jolyon Goes to the Opera" http://www.gutenberg.org/etext/2559, it's said of Old Jolyon that, "He naturally despised the Club that did take him." after another refused him because he was in a trade.
Variant: I sent the club a wire stating: «Please accept my resignation. I don't want to belong to any club that will accept me as a member».
Source: Groucho and Me
The Other World (1657)
Context: The most competent physician of our world advises the patient to listen to an ignorant doctor who the patient thinks is very competent rather than to a competent doctor who the patient thinks is ignorant. He reason is that our imagination works for our good health, and as long as it is supplemented by remedies, it is capable of healing us. But the most powerful remedies are too weak when the imagination does not apply them.