“A scientist can be tactful and PC with his mouth, but not his ears or eyes and certainly not his mind. Truth must reign there above all. For your first allegiance is either to Truth or to Ignorance. Worry about offending, and you are choosing Ignorance.”

in Quotable Patri http://patrifriedman.com/quotes/patri.html

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Patri Friedman4

American libertarian activist and theorist of political eco… 1976

William Paton Mackay (1839–1885) Scottish clergyman

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 337.

“Man loves knowledge, and the beams of truth
More welcome touch his understanding's eye
Than all the blandishments of sound his ear,
Than all of taste his tongue.”

Mark Akenside book The Pleasures of the Imagination

Book II, lines 100–103
The Pleasures of the Imagination (1744)

“It is almost as difficult to make a man unlearn his errors as his knowledge. Mal-information is more hopeless than non-information; for error is always more busy than ignorance. Ignorance is a blank sheet, on which we may write; but error is a scribbled one, on which we must first erase. Ignorance is contented to stand still with her back to the truth; but error is more presumptuous, and proceeds in the same direction. Ignorance has no light, but error follows a false one. The consequence is, that error, when she retraces her footsteps, has further to go, before she can arrive at the truth, than ignorance.”

Charles Caleb Colton (1777–1832) British priest and writer

Vol. I; I
Lacon (1820)

“When a devil, but also a saint, laughs about your poetry, you laugh about his ignorance!”

Menotti Lerro (1980) Italian poet

Donna Giovanna, Act IV, scene iii.

“Shackle your mind when you bend on the cross,
When ignorance reigns life is lost.”

Zack de la Rocha (1970) American musician, poet rapper and activist best known as the vocalist and lyricist of rap metal band Rage Again…

Township Rebellion.
Song lyrics, Rage Against the Machine (1992)

“When the doctrine of allegiance to party can utterly up-end a man's moral constitution and make a temporary fool of him besides, what excuse are you going to offer for preaching it, teaching it, extending it, perpetuating it? Shall you say, the best good of the country demands allegiance to party? Shall you also say it demands that a man kick his truth and his conscience into the gutter, and become a mouthing lunatic, besides?”

Mark Twain (1835–1910) American author and humorist

"Consistency", paper read at the Hartford Monday Evening Club on 5 December 1887. The Complete Essays of Mark Twain, p. 582 http://books.google.com/books?id=sujuHO_fvJgC&pg=PA582&dq=%22When+the+doctrine+of+allegiance%22 (First published in the 1923 edition of Mark Twain's Speeches, ed. Albert Bigelow Paine, pp. 120-130, where it is incorrectly dated "following the Blaine-Cleveland campaign, 1884." (See Mark Twain's Notebooks & Journals (1979), ed. Frederick Anderson, Vol. 3, p. 41, footnote 92 http://books.google.com/books?id=kMbeUm4pJwsC&pg=PA41) Many reprints repeat Paine's dating.)