“Doctors is all swabs…and that doctor there, why, what do he know about seafaring men? I been in places hot as pitch, and mates dropping round with Yellow Jack, and the blessed land a-heaving like the sea with earthquakes — what do the doctor know of lands like that?”

— Robert Louis Stevenson , book Treasure Island

and I lived on rum, I tell you.
Source: Treasure Island (1883), Ch. 3, The Black Spot.

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Do you have more details about the quote "Doctors is all swabs…and that doctor there, why, what do he know about seafaring men? I been in places hot as pitch, an…" by Robert Louis Stevenson?

Robert Louis Stevenson 118

Scottish novelist, poet, essayist, and travel writer 1850–1894

Thomas Brown (1662–1704) English translator and writer of satire

Laconics, reported in Bartlett's Familiar Quotations, 10th ed. (1919). A slightly different version is found in Brown's Works collected and published after his death. Compare: "Non amo te, Sabidi, nec possum dicere quare; Hoc tantum possum dicere, non amo te" (translation: "I do not love thee, Sabidius, nor can I say why; this only I can say, I do not love thee"), Martial, Epigram i. 33; "Je ne vous aime pas, Hylas; Je n'en saurois dire la cause, Je sais seulement une chose; C'est que je ne vous aime pas", Marquis de Bussy-Castelnau, Comte de Rabutin (1618–1693).
Source: See,Talk discussion

“Everybody knows that everybody dies and nobody knows it like the Doctor. But I do think that all the skies of all the worlds might just turn dark if he ever, for one moment, accepts it.”

Steven Moffat (1961) Scottish television writer and producer

Lines written for River Song, in Forest of the Dead [4.9] (7 June 2008)
Context: When you run with the Doctor, it feels like it'll never end. But however hard you try you can't run forever. Everybody knows that everybody dies and nobody knows it like the Doctor. But I do think that all the skies of all the worlds might just turn dark if he ever, for one moment, accepts it.

“Doctor doctor, what do you say, lets put the id back in yid”

Philip Roth book Portnoy's Complaint

Source: Portnoy's Complaint

“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)