Who really said it

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

Q: Did Voltaire say "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"?

No. No Voltaire text containing this has ever been produced, in French or English. The decisive detail is linguistic: the French version in circulation does not read like eighteenth-century French and appears to be a back-translation from the English — the reverse of what you would find if a French philosopher had written it. It is an anonymous twentieth-century medical joke that acquired a famous name.

Not Voltaire — author unknown Unknown earliest English attributions: 1950s

Disputed Rights unconfirmed

No Voltaire text containing this has ever been produced, in French or English. The decisive detail is linguistic: the French version in circulation does not read like eighteenth-century French and appears to be a back-translation from the English — the reverse of what you would find if a French philosopher had written it. It is an anonymous twentieth-century medical joke that acquired a famous name.

Last verified 20 Jul 2026 · how we verify · spot an error?

For presentations

Put it on a slide

Disputed credit — copy with the correction

“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” 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. —Author unknown, 20th century. Commonly misattributed to Voltaire.

The slide-ready mistake: crediting this to Voltaire. Use the credit shown above instead.

Can you use it?

We couldn’t verify where this wording comes from, so there’s no rights status to give. Safe to present as an unverified or anonymous line — just don’t assert a specific author or source.

Image direction — grounded in this quote’s real context; paste into your image tool

In context

Evoking the world of Voltaire — French Enlightenment philosopher. Theme: "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". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.

Minimalist

Minimalist editorial slide for the quote "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". Clean background, a single muted accent color, generous negative space, subtle paper or linen texture, no literal illustration — let the words carry it. Reserve clear space for a serif quote and a small credit line. No lettering in the image itself.

Provenance

The source

Voltaire source: None — never produced
French ‘original’: Appears back-translated from English; modern
Earliest English attributions: Reported from the 1950s (not independently confirmed)
Hard citation: Maurice B. Strauss, Familiar Medical Quotations (1968), p. 394

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. No Voltaire source

The English as it circulates. There is no authentic French behind it to compare against — which is itself the finding.

Voltaire — Wikiquote (unsourced and disputed)

How we traced it

No primary Voltaire text has ever been produced. Wikiquote files it under unsourced, with the key observation that the French version ‘does not appear to be original, and is probably a relatively modern invention,’ quoted only in recent works that credit Voltaire without citing anything Wikiquote ↗.
That is the diagnostic: for a genuine Voltaire line the French comes first and the English follows. Here the French behaves like a translation of the English — the same signature that exposes other ‘translated’ fakes.
The attribution was cemented by Maurice B. Strauss’s Familiar Medical Quotations (Little, Brown, 1968), p. 394, which is the source most later quotation books copy. Earlier English appearances are reported from the mid-1950s, but we have not inspected one directly and do not assert that date as confirmed unsourced list ↗.

No Voltaire basis, so no public-domain Voltaire text to lean on. The English wording is a twentieth-century formulation of unknown authorship — nobody to credit, no rights holder to clear, and a sentence of this length would not attract copyright in the United States. Use it as an anonymous saying if you use it at all, and do not present any French text as the original: none is authentic. This is not legal advice.

Fact-check

The attribution problem

There is no Voltaire text to argue about here. The interesting part is how confidently the attribution travels, and the linguistic evidence that quietly rules it out.

Not Voltaire no source, ever

Nothing in his works, letters or contes contains it. Every printing that credits him cites nothing — the attribution has never had evidence at any point in its life Wikiquote ↗.

Back-translated from English the decisive test

Voltaire wrote in French. A genuine line would exist in French first. The circulating French reads as a modern rendering of the English, which is what happens when an English aphorism is retrofitted with a French author.

William Osler different saying

The similar ‘doctors put drugs of which they know little into bodies of which they know less’ circulates under Osler’s name and is also frequently mislabelled Voltaire. Two unsourced medical jokes, both borrowing authority.

Author unknown, twentieth century. No Voltaire source exists, and the French version appears to be translated from the English rather than the other way round the finding ↗.

Context

Why it resonates

The triple structure does the work — little, less, nothing — escalating to the punchline that the one thing doctors understand least is the patient. It is a good joke, and good jokes need a good name attached.

It also lands differently depending on the century you assign it to. As an eighteenth-century line it reads as Enlightenment scepticism about a pre-scientific profession; as a twentieth-century line, which is what it is, it reads as a complaint about modern medicine.

Voltaire wrote in French. The French looks translated from English.

What we can and cannot date

Confirmed: Maurice B. Strauss, Familiar Medical Quotations (1968), p. 394 — credited to Voltaire, uncited.

Reported but not inspected by us: English appearances from the mid-1950s.

Not found: any French text by Voltaire, or any French printing that predates the English.

Variants: ‘…for human bodies of which they know nothing’; singular ‘A doctor is someone who…’

Explore

Filed under

More provenance-checked quotes on the same theme, each with its reuse status.

Doubt Knowledge

Go further

Dig deeper

Trusted places to keep pulling the thread — primary archives, fact-checks, and scholarship. We show how we used each one before you leave.

Voltaire — Wikiquoteen.wikiquote.org

The disputed and unsourced sections, including the finding that the French version looks like a modern invention.

Talk:Medicine — unsourced quotationsen.wikiquote.org

Where the line sits among medical quotations with no primary citation.

Popularly credited author

Why it gets pinned on Voltaire

Voltaire

1694–1778 · French Enlightenment philosopher

Voltaire did write real medical satire — he was sceptical of physicians and said so in print — which is exactly why this sticks. A joke about doctors knowing nothing sounds like him, and once a witty anticlerical, antiauthoritarian aphorism needs an author, he is among the first three names anyone reaches for. Plausibility, not evidence, is what keeps this one in circulation.

For writers & researchers

Cite this

Primary source — Chicago

Strauss, Maurice B., ed. Familiar Medical Quotations. Boston: Little, Brown, 1968, p. 394. Attributed to Voltaire without primary citation; author unknown.

MLA (9th ed.)

Strauss, Maurice B., editor. Familiar Medical Quotations. Little, Brown, 1968, p. 394.

APA (7th ed.)

Strauss, M. B. (Ed.). (1968). Familiar medical quotations (p. 394). Little, Brown. (Attributed without source to Voltaire)

This verification page

Quotle.info. “Who really said ‘Doctors are men who prescribe medicines of which they know little’?” Last verified 20 Jul 2026. https://quotle.info/who-said/doctors-are-men-who-prescribe-medicines-of-which-they-know