“Intolerance is inclined to censor, and censorship promotes ignorance of the arguments of others and thus intolerance itself: a rigid, vicious circle that is hard to break.”
The Drowned and the Saved (1986)
Context: In countries and epochs in which communication is impeded, soon all other liberties wither; discussion dies by inanition, ignorance of the opinion of others becomes rampant, imposed opinions triumph. The well-known example of this is the crazy genetics preached in the USSR by Lysenko, which in the absence of discussion (his opponents were exiled to Siberia) compromised the harvests for twenty years. Intolerance is inclined to censor, and censorship promotes ignorance of the arguments of others and thus intolerance itself: a rigid, vicious circle that is hard to break.
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Primo Levi 44
Italian chemist, memoirist, short story writer, novelist, e… 1918–1987Related quotes

“Books and ideas are the most effective weapons against intolerance and ignorance.”

“I remain in intolerable non-knowledge, which has no other way out than ecstasy itself.”
Source: L’Expérience Intérieure (1943), p. 12

Speech https://api.parliament.uk/historic-hansard/commons/1871/may/03/second-reading in the House of Commons (3 May 1871) on the Women's Disabilities Bill.
1870s

“My mother said I must always be intolerant of ignorance but understanding of illiteracy.”

“Through a vicious circle of pure reason skepsis itself becomes dogma.”
Briefwechsel, ed. Arthur Henkel (1955-1975), vol. V, p. 432.

Source: A Discourse on the Love of Our Country (1789), p. 13

Rights expert urges the UN General Assembly to adopt a more decisive role in peace-making (For International Day of Peace, Saturday 21 September 2013) http://dezayasalfred.wordpress.com/2013/09/26/rights-expert-urges-the-un-general-assembly-to-adopt-a-more-decisive-role-in-peace-making-for-international-day-of-peace-saturday-21-september-2013/.
2013, 2013 - International Peace Day

Remarks by President Obama to the United Nations General Assembly https://www.whitehouse.gov/the-press-office/2015/09/28/remarks-president-obama-united-nations-general-assembly (September 28, 2015)
2015