Quotes about ignorance
page 10
Robert Barry (1980) in: Alexander Alberro (2003). Conceptual Art and the Politics of Publicity. Alberro noted: "Barry has since discussed the way in which this painting accented the structural support..."

Counterterrorism and Cybersecurity: Total Information Awareness (2nd Edition), 2015
Quoted in In Hitler's Bunker: A Boy Soldier's Eyewitness Account of the Fuhrer's Last Days (2005) by Armin D. Lehmann and Tim Carroll, p. 91, and in The Rise of the Fourth Reich: The Secret Societies That Threaten to Take Over America (2009) by Jim Marrs, p. 342.
“I speak from ignorance.
Who once learned much, but speaks from ignorance now.”
Poem Last of the Chiefs published in: Nathaniel Tarn (1965) Old savage, young city. p. 18.
Or deplore them.
“New Year Letter”, p. 56
Kipling, Auden & Co: Essays and Reviews 1935-1964 (1980)

Source: The house on the hill (1949), Chapter 8, p. 105

Letter to chairman of the RNC http://www.textfiles.com/politics/ron_paul.txt Frank Fahrenkopf (March 1987).
1980s

Source: 1880s, Incidents and Anecdotes of the Civil War (1885), p. 296

26 November 2014, Twitter
Speaking & Features

Source: Rule 34 (2011), Chapter 20, “Liz: Bereavement Counselling” (p. 229)

Source: Mathematical Lectures (1734), pp. 26-27

“Creators of history always play with our impotence and our ignorance.”
"Game III," p. 98
The Sun Watches the Sun (1999), Sequence: “A Game”

Horowitz speaks about Obama birth certificate doubters. [David, Horowitz, http://www.nationalreview.com/article/226474/obama-derangement-syndrome-david-horowitz, "Shut up about the birth certificate.", nationalreview.com, December 8, 2008, 2016-30-03]
2008

comp.os.minix: LINUX is obsolete, 1992-01-29, Torvalds, Linus, 2008-12-31 http://groups.google.com/group/comp.os.minix/msg/9f3c7c165aacc83f?dmode=source,
1990s, 1991-94

2010s, 2016, July, (21 July 2016)
2000s

http://www.paulglover.org/7812.html (“America the Hard Way”), The Grapevine, cover story, Walk Across the USA), 1979-01-10

1950s, On the Generalized Theory of Gravitation (1950)

"The Russian-Jewish Revolution", Auf Gut Deutsch magazine, February 1919. Quoted in Roderick Stackelberg, Sally A. Winkle, The Nazi Germany Sourcebook: An Anthology of Texts. Routledge, 2013 (p.50). Also in Barbara Miller Lane and Leila J. Rupp, Nazi Ideology Before 1933: A Documentation. University of Texas Press, 2014 (p.12).

Burke and the Edinburgh Phrenologists in The Atlas (15 February 1829); reprinted in New Writings by William Hazlitt, William Hazlitt and Percival Presland Howe (ed.), (2nd edition, 1925), p. 117; also reprinted in The Complete Works of William Hazlitt, Volume 20: Miscellaneous writings, (J.M. Dent and Sons, 1934), (AMS Press, 1967), p. 201

Source: Cannibals All!, or Slaves Without Masters (1857), p. 108
“Systems theory, in its concern for the whole and its emergent properties, ignores the components.”
Source: Society: A Complex Adaptive System--Essays in Social Theory, (1998), p. 183 as cited in: Kenneth D. Bailey (2006).

Mont Saint Michel and Chartres (1904)
"Richard Stone - Biographical," 1984
http://www.lindberghfoundation.org/events/past.html

The Shah's Address to Harvard University - Creation of the Universal Welfare Legion - June 13, 1968 http://members.cybertrails.com/~pahlavi/harvard.html
Speeches, 1968

Part 2 “Aleph”, Chapter 2 (p. 51)
Against Infinity (1983)
Source: Dealing with Complexity (1988), p. 79.

The Confession (c. 452?)

Source: Another World Is Possible : Globalization and Anti-capitalism (2002), Chapter 2, Globalization - It's Not About Free Trade, p. 30

[Maurice Allais, L'anisotropie de l'espace. La nécessaire révision de certains postulats des théories contemporaines. Les données de l'expérience, Editions Clément Juglar, Paris, 1997, 506, 2-908735-09-1]

An unpublished paper of 1907, as quoted in The Rising American Empire (1960) by Richard Warner Van Alstyne, p. 201; also quoted in On Power and Ideology (1987) by Noam Chomsky; accounts of this as being from a lecture of 15 April 1907 seem to be incorrect.
1900s

1
Fruits of Solitude (1682), Part I

Frontlines and Frontiers: Making Human Rights a Human Reality (December 6, 2012) http://www.state.gov/secretary/20092013clinton/rm/2012/12/201618.htm
Secretary of State (2009–2013)

My Life and Confessions, for Philippine, 1786

The Second Declaration of Havana (1962)

Tennis Player Michael Joyce's Professional Artistry as a Paradigm of Certain Stuff about Choice, Freedom, Discipline, Joy, Grotesquerie, and Human Completeness
Essays

Great Books: The Foundation of a Liberal Education (1954)

The trial of Charles B. Reynolds for blasphemy (1887)

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 36.

From Attention Deficit Democracy (Palgrave, 2006) http://www.jimbovard.com/Epigrams%20Attention%20Deficit%20Democracy.htm

Chris Eubank http://observer.guardian.co.uk/osm/story/0,,1010013,00.html#article_continue
Further Studies in a Dying Culture (1949), Chapter IV: Consciousness: A Study in Bourgeois Psychology
The Anabaptist Story (1996), p. 142
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 35.
“They pass peaceful lives who ignore mine and thine.”
Maxim 790
Sentences, The Moral Sayings of Publius Syrus, a Roman Slave

1880s, Speech Nominating John Sherman for President (1880)
The quote is almost identical to a block of narration from the 1984 movie version of "1984", which is excerpted from various parts of the novel Nineteen Eighty-Four with some paraphrasing.
2004, Fahrenheit 9/11 (2004)

[The fact appears to be that] “After eight centuries of galling subjection to conquerors totally ignorant of the classical language of the Hindus; after every capital city had been repeatedly stormed and sacked by barbarous, bigoted, and exasperated foes; it is too much to expect that the literature of the country should not have sustained, in common with other interests, irretrievable losses.”
James Tod, Annals and Antiquities of Rajasthan, Routledge and Kegan Paul (London,l829,1957), 2 vols., I quoted from Lal, K. S. (1992). The legacy of Muslim rule in India. New Delhi: Aditya Prakashan. Chapter 3

Let Your Life Speak: Listening for the Voice of Vocation (1999)

Pitt's Reply to Walpole, Speech, March 6, 1741. This is the composition of Johnson, founded on some note or statement of the actual speech. Johnson said, "That speech I wrote in a garret, in Exeter Street." Boswell: Life of Johnson, 1741
Bartlett's Familiar Quotations, 10th ed. (1919)

In 1988, Richter painted a series of 15 works titled 'October 18, 1977.' It shocked Germany, especially left. The series was based on photographs of the anti-capitalist Baader-Meinhof group, which called itself the Rote Armee Fraktion (Red Army Fraction) and were in prison and died in 1977.
after 2000, Gerhard Richter: An Artist Beyond Isms' (2002)
The Devil's Notebook (1992)

“Wisdom and intellect is every man's friend, ignorance and illiteracy are his enemies.”
Ibn Shu’ba al-Harrani, Tuhaf al-'Uqul, p. 467.
Regarding Knowledge & Wisdom, General
How Not to Complain About Taxes (III): "I deserve my pretax income" http://left2right.typepad.com/main/2005/01/how_not_to_comp_1.html (January 26, 2005)

De Potentia (On Power) q. 3, art. 6, ad 4

Mont Saint Michel and Chartres (1904)
2010s, And Then What? (June 2018)

1920s, The Aims of Education (1929)

Source: Understanding International Conflicts: An Introduction to Theory and History (6th ed., 2006), Chapter 1, Is There an Enduring Logic of Conflict in World Politics?, p. 2.

Book 4, “Hell’s Blue Burning Seas” Chapter 15 (p. 208)
The Storm Lord (1976)

"Mediasaurus: The decline of conventional media" - Speech at the National Press Club, Washington D.C. (7 April 1993)

Address to White House Correspondents' Association, Washington, D.C. (12 February 1943)
1940s

“If ignorance is bliss, then I'm in heaven now.”
"3's & 7's", Era Vulgaris (2007)
Lyrics, Queens of the Stone Age

The Education of Henry Adams (1907)
Source: Metasystems Methodology, (1989), p.xi-xii, cited in Philip McShane (2004) Cantower VII http://www.philipmcshane.ca/cantower7.pdf

Source: Simone Weil : An Anthology (1986), The Iliad or The Poem of Force (1940-1941), p. 193

Thought and Change (1964)

Source: Sayings of Sri Ramakrishna (1960), p. 955

"The Office of the People in Art, Government and Religion", p. 430
Literary and Historical Miscellanies (1855)

Speech in the House of Commons (2 March 1790), quoted in Loren Reid, Charles James Fox: A Man for the People (1969), p. 261.
1790s

An account of the European Settlements in America (1757), pp. 19-20, in The Works of Edmund Burke in Nine Volumes, Vol. IX. Boston: Little, Brown (1839)
1750s

The Education of Henry Adams (1907)

source http://www.spinwithagrin.com/answer.asp?show=all
Source: PsyberMagick (1995), p. 46

“Ah, but ignorance is better. At least then there's hope.”
Act II
Uncle Vanya (1897)
Ch 20
A Canticle for Leibowitz (1959), Fiat Lux
"Rock for Sale"; quoted in The Sociology of Rock, Simon Frith, 1978, ISBN 0094602204
Four Minute Essays Vol. 5 (1919), Clean Business