“False and doubtful positions, relied upon as unquestionable maxims, keep those who build on them in the dark from truth.”
Book IV, Ch. 7
An Essay Concerning Human Understanding (1689)
Context: False and doubtful positions, relied upon as unquestionable maxims, keep those who build on them in the dark from truth. Such are usually the prejudices imbibed from education, party, reverence, fashion, interest, et cetera.
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John Locke 144
English philosopher and physician 1632–1704Related quotes

“Believe those who seek the truth, doubt those who find it; doubt all, but do not doubt yourself.”
Ainsi soit-il; ou, Les Jeux sont faits
So be it; or, The chips are down
Gallimard
1952
174
Original: (fr) Croyez ceux qui cherchent la vérité, doutez de ceux qui la trouvent; doutez de tout, mais ne doutez pas de vous-même.

“Keep the company of those who seek the truth- run from those who have found it”

Observations on Certain Documents http://books.google.com/books?id=Aemk203kBPoC&q="It+is+a+maxim+deeply+ingrafted+in+that+dark+system+that+No+character+however+upright+is+a+match+for+constantly+reiterated+attacks+however+false"&pg=PA377#v=onepage, also known as The Reynolds Pamphlet (1797)

“Trust those who seek the truth but doubt those who say they have found it.”
<!--from Gide's Journal 1939-1949-->
Variant: Believe those who seek the truth, doubt those who find it
Context: Believe those who seek the truth, doubt those who find it; doubt all, but do not doubt yourself.

The Art of Persuasion

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter I, Sec. 2

Letter to Allen N. Ford (11 August 1846), reported in Roy Prentice Basler, ed., Abraham Lincoln: His Speeches and Writings (1990 [1946])
1840s

Don, in The Philanthropist (1969), scene 6