Speech at the 24th International Vegetarian Congress, India, 1977; quoted in The Vegetarians by Rynn Berry (Autumn Press, 1979), pp. 133-134.
Quotes about ideal
page 7

Interview, Feb 3 1964, reproduced in Talks With Authors, ed. Charles F. Madden

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), Human Immortality: its Positive Argument, p.310

Source: 1950s-1960s, Social Choice and Individual Values (1951), p. 83
Beer (1974) Designing Freedom. House Of Anansi Press, Toronto cited in: B. Dawson (2007) "Bertalanffy Revisited: Operationalizing A General Systems Theory Based Business Model Through General Systems Thinking, Modeling, And Practice", In: Proceedings of the 51st Annual Meeting of the ISSS, 2007.

Une telle morale [la morale existentialiste] est-elle ou non un individualisme? Oui, si l’on entend par là qu’elle accorde à l’individu une valeur absolue et qu’elle reconnaît qu’a lui seul le pouvoir de fonder son existence. Elle est individualisme au sens où les sagesses antiques, la morale chrétienne du salut, l’idéal de la vertu kantienne méritent aussi ce nom ; elle s’oppose aux doctrines totalitaires qui dressent par-delà I’homme le mirage de l’Humanité. Mais elle n’est pas un solipsisme, puisque l’individu ne se définit que par sa relation au monde et aux autres individus, il n’existe qu’en se transcendant et sa liberté ne peut s’accomplir qu’à travers la liberté d’autrui. Il justifie son existence par un mouvement qui, comme elle, jaillit du coeur de lui-même, mais qui aboutit hors de lui.
Cet individualisme ne conduit pas à l’anarchie du bon plaisir. L’homme est libre ; mais il trouve sa loi dans sa liberté même. D’abord il doit assumer sa liberté et non la fuir; il l’assume par un mouvement constructif : on n’existe pas sans faire; et aussi par un mouvement négatif qui refuse l’oppression pour soi et pour autrui.
Conclusion http://www.marxists.org/reference/subject/ethics/de-beauvoir/ambiguity/ch04.htm
The Ethics of Ambiguity (1947)

1920s, Authority and Religious Liberty (1924)

“All alone I gave
Myself for triumph the ideal sin of roses.”
The Afternoon of a Faun (1876)

Source: 1930s, "Protocol Statements" (1932), p. 91

Concepts
In doing so he "transformed cowards into brave men, and so fulfilled the purpose of shining armour."
Source: 1980s, The Last Lion: Winston Spencer Churchill: Alone 1932-1940 (1988), p. 687
1960s, "The Study of Conflict," 1968

a quote of her Journal, Worpswede 1897; as cited in Voicing our visions, – Writings by women artists; ed. Mara R. Witzling, Universe New York, 1991, p. 192
1897
Source: The Romantic Generation (1995), Ch. 1 : Music and Sound

Source: One is A Crowd: Reflections of An Individualist (1952), pp. 36-37

Speech to the Women's National Liberal Association Conference, Memorial Hall, London (12 June 1901), quoted in The Times (13 June 1901), p. 12.
1900s

“The ideal man bears the accidents of life
With dignity and grace, the best of circumstances.”
Act V, scene i.
Cato, A Tragedy (1713)

Source: Why We Fail as Christians (1919), p. 29-30
Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 57.

Source: The Image: A Guide to Pseudo-Events in America (1961), p. 245.

After the Revolution? (1970; 1990), Ch. 4 : From Principles to Problems

Written at Camp Elsinore, Upper St. Regis Lake, New York, June 24, 1898. From Book News, Aug 1898.

“Every novel is an ideal plane inserted into the realm of reality.”
"Partial Magic in the Quixote", Labyrinths (1964)
Source: Leonardo da Vinci (1939), Ch. Three: The Notebooks
There is no threat. Weapons and colour https://www.youtube.com/watch?v=qqfjr78Pyfs, video, Galeria Olympia, 23 November 2017 (in Polish)

" " (nothing) published in the Personal Journal of Shalosh B. Ekhad and Doron Zeilberger

1950s, Farewell address to Congress (1951)
Philip Selznick, quoted in Charles Perrow (1960, p.4), as cited in: Owen A. Jones. The Sources of Goal Incongruence in a Public Service Network. 2013. p. 35-36

Jan Myrdal in a speech against the European Union in the Swedish town Falun. http://web.fib.se/visa_fast_info.asp?Avdelning=017&Sidrubrik=Nyheter&Rubrik=F%F6r%20nationen%20och%20kulturen&Meny=027&e=e005

Du sollst dir kein Ideal machen, weder eines Engels im Himmel, noch eines Helden aus einem Gedicht oder Roman, noch eines selbstgeträumten oder fantasirten; sondern du sollst einen Mann lieben, wie er ist.
Philosophical Fragments, P. Firchow, trans. (1991), “Athenaeum Fragments,” § 364

“Our founding fathers wrote a constitution for a dream. We have given passports to their ideals.”
"The Shashi Tharoor column: The creation of India," 2001

Time and Individuality (1940)
Source: The Next Development in Man (1948), p. 261-262

The Renaissance in India (1918)

The New Day: Campaign Speeches of Herbert Hoover (1928)

On the Clinton-Lewinsky scandal in a column titled "Why Clinton Must Resign or Be Impeached" — https://www.bustle.com/p/mike-pence-quotes-about-impeachment-reveal-what-he-really-thinks-of-presidents-having-affairs-10026765 (circa late 1990s)

Introduction to "It Makes a Fellow Proud to be a Soldier"
An Evening (Wasted) With Tom Lehrer (1959)
Social Sciences as Sorcery (1972)
“Ideal legislators do not vote their interests.”
Source: A Theory of Justice (1971; 1975; 1999), Chapter V, Section 43, p. 284

Mont Saint Michel and Chartres (1904)

Lecture IX, "Conversion, concluded"
1900s, The Varieties of Religious Experience (1902)
“Ideally a just constitution would be a just procedure arranged to insure a just outcome.”
Source: A Theory of Justice (1971; 1975; 1999), Chapter IV, Section 31, pg. 197

Source: The Income Tax: Root of All Evil (1954), p. 54

As quoted in "A soldier's view on Trump" http://www.cnn.com/2016/03/04/opinions/donald-trump-military-hertling/index.html CNN, 4 March 2016

1920s, Freedom and its Obligations (1924)

Speech to the Economic Students' Union at the School of Economics and Political Science, London (14 December 1900), quoted in The Times (17 December 1900), p. 13.
1900s

Source: Evolution and Theology (1900), p. 11.

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), The Harmony of Determinism and Freedom, p.338-9

“In an ideal world, where there are only good states, power would be largely irrelevant.”
Source: The Tragedy of Great Power Politics (2001), Chapter 1, Introduction, p. 16

Scene by Scene interview BBC 2 (1999) http://web.archive.org/20040210020322/members.fortunecity.com/vanessa77/index2005.html

Speech in Winnipeg, Canada (13 August 1927), quoted in Our Inheritance (London: Hodder and Stoughton, 1938), pp. 108-109.
1927
"Penitence and Social Progress" World Tomorrow 15 (May, 1932)

"On Paradox and Common-Place"
Table Talk: Essays On Men And Manners http://www.blupete.com/Literature/Essays/TableHazIV.htm (1821-1822)

Manchester Guardian, 2 July 1934, quoted in Bernard Donoughue and George Jones, "Herbert Morrison: Portrait of a Politician" (Phoenix Press, 2001), p. 184.
But man is not made to live "out there" permanently! Certainly, it is a more valuable question, as such, to ask about the whole world and the ultimate nature of things. But the answer is not as easily forthcoming as for the special sciences!
The Dilthey quote is from Briefwechsel zwischen Wilhelm Dilthey und dem Grafen Paul Yorck v. Wartenberg, 1877–1897 (Hall/Salle, 1923), p. 39.
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, pp. 109–111
"George Jean Nathan" (1953), p. 61
Profiles (1990)

“The opposite of pragmatism is not idealism. It’s wishful thinking.”
Quoted in [Willies, Egberto, October 11, 2015, http://www.dailykos.com/story/2015/10/11/1430614/-Barney-Frank-has-a-message-for-Bernie-Sanders-supporters-they-won-t-like, "Barney Frank has a message for Bernie Sanders supporters they won't like", dailykos.com, 2015-10-11]

Security and Liberty, April 23, 2007 http://www.house.gov/paul/tst/tst2007/tst042307.htm
2000s, 2006-2009
The Pageant of Life (1964), On Priests & Bishops

"Liberal Values in the Modern World," in Power , Politics and People (1963), p. 189.
1960s

Alanis Morissette - Wake Up San Francisco with Adyashanti & Tami Simon - YouTube (28 March 2015; starts at 14:17) https://www.youtube.com/watch?v=Jr_ClddVgJs

Quote in Jorn's letter, 1952; as cited on the website of the Jorn Museum 'Articles' by Jorn http://www.museumjorn.dk/en/article_presentation.asp?AjrDcmntId=255,
his critical comment on the art teachings of Fernand Léger, which Jorn started to follow circa 1936, in Paris.
1949 - 1958, Various sources
And above all else, "Remember that all the other caveats are only reminders and warning signs whose application to different circumstances of the real world is contingent."
"The Problem of Lysenkoism" by Richard Lewontin and Richard Levins, in Hilary and Steven Rose (eds.), The Radicalisation of Science, Macmillan, 1976, p. 58.

Unpublished Letter of Complaint to The New York Review of Books

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), The Right Relation of Reason to Religion, p.251

Weggefährten - Erinnerungen und Reflexionen, Siedler-Verlag Berlin 1996, S. 54, ISBN 9783442755158, ISBN 978-3442755158

Source: The Ideology of Fascism: The Rationale of Totalitarianism, (1969), p. 293
"On Spiritual Matters", American Record Guide, Jul/Aug2004

On the occasion of the opening of Forty Years of Modern Art (February 1948)
Literary Quotes
On Politics: A History of Political Thought: From Herodotus to the Present (2012), Ch. 4 : Roman Insights: Polybius and Cicero

1990s, Copyleft: Pragmatic Idealism (1998)

Lecture II, "Circumscription of the Topic"
1900s, The Varieties of Religious Experience (1902)

“We consider that the United Nations' ideal is a Jewish ideal.”
As quoted in "The Watchman" in TIME magazine (16 August 1948) http://www.time.com/time/magazine/article/0,9171,798932-2,00.html

Johannes Climacus (1841) p. 80-81
1840s, Johannes Climacus (1841)
'Painting and Culture' p. 58
Search for the Real and Other Essays (1948)

40:35
“ Our Only Hope Will Come Through Rebellion http://www.youtube.com/watch?v=TOlg_2qAbUA” (2014)

Regarding comments made by Trent Lott (12 December 2002), as quoted in "Lott's Remarks on Segregation 'Wrong and Offensive'" https://web.archive.org/web/20150921020713/http://www.irishtimes.com/news/lott-remarks-on-segregation-wrong-and-offensive-1.1107399 (13 December 2002), The Irish Times
2000s, 2002

2000s, 2006, United Nations General Assembly speech (September 2006)

Interview by Bill Moyers on Bill Moyers' World Of Ideas (17 October 1988); transcript http://www.pbs.org/moyers/faithandreason/print/pdfs/woi%20asimov1.pdf (page 6) - audio (20:12) http://www.pbs.org/moyers/faithandreason/media_players/asimovwoi_audio.html
General sources
Source: 1960s - 1970s, The Systems Approach and Its Enemies (1979), p. 106