“It is the same with the use of force, whether of the mob or of the State, upon diseased society; and not only those who prescribe its indiscriminate use as a sovereign remedy and a permanent tonic, but all who ever propose it as a cure, and even all who would lightly and unnecessarily resort to it, not as a cure, but as an expedient, are social quacks.”
Individual Liberty (1926), Passive Resistance
Context: When a physician sees that his patient's strength is being exhausted so rapidly by the intensity of his agony that he will die of exhaustion before the medical processes inaugurated have a chance to do their curative work, he administers an opiate. But a good physician is always loath to do so, knowing that one of the influences of the opiate is to interfere with and defeat the medical processes themselves. He never does it except as a choice of evils. It is the same with the use of force, whether of the mob or of the State, upon diseased society; and not only those who prescribe its indiscriminate use as a sovereign remedy and a permanent tonic, but all who ever propose it as a cure, and even all who would lightly and unnecessarily resort to it, not as a cure, but as an expedient, are social quacks.
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Benjamin Ricketson Tucker 50
American journalist and anarchist 1854–1939Related quotes
“Those who have the disease called Jesus will never be cured.”
The Relentless Tenderness of Jesus https://books.google.com/books?id=xvv4HcYdxd0C&pg=PA42&dq=%22Those+who+have+the+disease+called+Jesus+will+never+be+cured.%22&hl=en&sa=X&ved=2ahUKEwi9_f7L-JTkAhXJ1VkKHfSGDHUQ6AEwAXoECAEQAg#v=onepage&q=%22Those%20who%20have%20the%20disease%20called%20Jesus%20will%20never%20be%20cured.%22&f=false (1986), p. 42
1980s
Source: The Ragamuffin Gospel: Good News for the Bedraggled, Beat-Up, and Burnt Out

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

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.

“We all labour against our own cure, for death is the cure of all diseases.”
Section 9
Religio Medici (1643), Part II