Quotes about possibility
page 6

Hitherto it has grown out of the secure, non-struggling life of the aristocrat. In future it may be expected to grow out of the secure and not-so-struggling life of whatever citizens are personally able to develop it. There need be no attempt to drag culture down to the level of crude minds. That, indeed, would be something to fight tooth and nail! With economic opportunities artificially regulated, we may well let other interests follow a natural course. Inherent differences in people and in tastes will create different social-cultural classes as in the past—although the relation of these classes to the holding of material resources will be less fixed than in the capitalistic age now closing. All this, of course, is directly contrary to Belknap's rampant Stalinism—but I'm telling you I'm no bolshevik! I am for the preservation of all values worth preserving—and for the maintenance of complete cultural continuity with the Western-European mainstream. Don't fancy that the dethronement of certain purely economic concepts means an abrupt break in that stream. Rather does it mean a return to art impulses typically aristocratic (that is, disinterested, leisurely, non-ulterior) rather than bourgeois.
Letter to Clark Ashton Smith (28 October 1934), in Selected Letters V, 1934-1937 edited by August Derleth and Donald Wandrei, pp. 60-64
Non-Fiction, Letters

1860s, Allow the humblest man an equal chance (1860)

Source: 1920s, Sceptical Essays (1928), Ch. 12: Free Thought and Official Propaganda, books.google.com https://books.google.com/books?id=9tQsg5ITfHsC&pg=PA127&dq=bertrand+russell,+%22diligent+search%22, archive.org https://archive.org/stream/freethoughtoffic00russuoft/freethoughtoffic00russuoft_djvu.txt

1860s, Letter to James C. Conkling (1863)

1790s, Letter to the Addressers (1792)

"Collins: Why this scientist believes in God" http://www.cnn.com/2007/US/04/03/collins.commentary/index.html, editorial, CNN (April 6, 2007)

380
Daybreak — Thoughts on the Prejudices of Morality (1881)

at St Quentin, during the videoshoot for St Anger

In Orlando after the Orlando nightclub shooting ([President Obama: Orlando Families' Grief Is 'Beyond Description', Time, Maya, Rhodan, June 16, 2016, September 2, 2018, http://time.com/4372190/orlando-shooting-barack-obama-joe-biden-grief/]; [‘Our hearts are broken, too’: Obama visits survivors of Orlando rampage, Katie, Zezima, Ellen, Nakashima, Mark, Berman, June 16, 2016, September 2, 2018, The Washington Post, https://www.washingtonpost.com/news/post-nation/wp/2016/06/16/obama-looks-toward-grieving-orlando-in-visit-as-political-showdowns-expand-after-massacre/]; [After meeting with Orlando victims, Obama renews call for gun control, Gregory, Korte, USA Today, June 16, 2016, September 6, 2018, https://www.usatoday.com/story/news/politics/2016/06/16/obama-biden-visit-orlando-emotional-visit-after-shooting/85973066/]).
2016, After the Orlando nightclub shooting (June 2016)

Cited as from an address in Addis Ababa (1963) in Simpson's Contemporary Quotations (1988) http://www.bartleby.com/63/73/1173.html edited by James B. Simpson ISBN 0395430852

Source: 1940s, A History of Western Philosophy (1945), Chapter XXXI "The Philosophy of Logical Analysis"

Biographical note; Quotes in: Horst Woldemar Janson, Anthony F. Janson, History of Art: The Western Tradition http://books.google.com/books?id=MMYHuvhWBH4C&pg=PT831&lpg=PT831, Prentice Hall Professional, 2004. p. 831

On Education, Especially in Early Childhood (1926), Ch. 2: The Aims of Education, p. 36.No one gossips about other people's secret virtues.
1920s

Letter to Gilbert Murray, March 21, 1903
1900s

Message of His Holiness Pope Francis to the Participants in the European Regional Meeting of the World Medical Association, From the Vatican, 7 November 2017 https://w2.vatican.va/content/francesco/en/messages/pont-messages/2017/documents/papa-francesco_20171107_messaggio-monspaglia.html
2010s, 2017

"On Denoting", Mind, Vol. 14, No. 56 (October 1905), pp. 479–493; as reprinted in Logic and Knowledge: Essays, 1901–1950, (1956)
1900s

1900s, The Strenuous Life: Essays and Addresses (1900), National Duties

On the Wardenclyffe Tower, in "The Future of the Wireless Art" in Wireless Telegraphy and Telephony (1908)
Relational Concepts in Psychoanalysis (Cambridge, Massachusetts: Harvard University Press, 1988), p. 91

Knox College Commencement Address (4 June 2005)
2005

"A Way Forward in Iraq", Remarks to the Chicago Council on Global Affairs (20 November 2006)
2006

“Sir, your ideas are incorrect in every possible respect.”
Source: Lyonesse Trilogy (1983-1989), Madouc (1989), Chapter 7, section 5 (p. 848)

1910s, The New Nationalism (1910)

Jeff Lord, "Will Democrats Apologize for Slavery and Segregation?" https://web.archive.org/web/20150630102356/http://spectator.org/articles/63244/will-democrats-apologize-slavery-and-segregation (25 June 2015), Knowing What We Know Now, The American Spectator.

“Well, I have tried to learn as much as possible from prior attempts.”
Conversation: Elon Musk on Wired Science (2007)

1900s, The Strenuous Life: Essays and Addresses (1900), National Duties

"The Transmission of Electric Energy Without Wires" in Electrical World and Engineer (5 March 1904)

Source: 1930s, Power: A New Social Analysis (1938), Ch. 1: The Impulse to Power

Source: 1880s, Personal Memoirs of General U. S. Grant (1885), Ch. 12.

Source: 1950s, My Philosophical Development (1959), p. 200

2016, State of the Union address (January 2016)

Letter to Pavel Vasilyevich Annenkov, (28 December 1846), Rue d'Orleans, 42, Faubourg Namur, Marx Engels Collected Works Vol. 38, p. 95; International Publishers (1975). First Published: in full in the French original in M.M. Stasyulevich i yego sovremenniki v ikh perepiske, Vol. III, 1912
Richard Carrier, "Bad Science, Worse Philosophy", Addendum B, http://www.infidels.org/library/modern/richard_carrier/addendaB.html#et_al at The Secular Web (Internet Infidels: 2000)
About

"What Is Justice?" (1952), published in What is Justice? (1957)

This is from a fictional speech by Lincoln which occurs in The Clansman : An Historical Romance of the Ku Klux Klan (1905) by Thomas Dixon, Jr.. On some sites this has been declared to be something Lincoln said "soon after signing" the Emancipation Proclamation, but without any date or other indications of to whom it was stated, and there are no actual historical records of Lincoln ever saying this.
Misattributed

Speech on the 24th Anniversary of the Revolution http://www.youtube.com/watch?v=8IGbjPqFFvA (7 November 1941)
Stalin's speeches, writings and authorised interviews

1910s, The Problems of Philosophy (1912)

English and Welsh (1955)

2015, Remarks at Panama Civil Society Forum (April 2015)

On the losing the 2005 Champions League final to Liverpool
Ibid [pp. 84-86]

1940s, Philosophy for Laymen (1946)

2015, Commemoration of the 150th Anniversary of the 13th Amendment (December 2015)

Kōnosuke Matsushita (1989) Nurturing Dreams My Path in Life. Quoted in: Tony Kippenberger (2002), Leadership Styles: Leading 08.04. p. 73

“Faith makes it possible to achieve that which man's mind can conceive and believe.”
Part 6 "Beyond System — The Ultimate Source of Jeet Kune Do"
Jeet Kune Do (1997)

Nobel Lecture (1998)

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 267.

"Some Notes on Interplanetary Fiction", Californian 3, No. 3 (Winter 1935): 39-42. Published in Collected Essays, Volume 2: Literary Criticism edited by S. T. Joshi, p. 178
Non-Fiction

Jan Tinbergen (1980), Reexamining the International Order Moscow: Progress Publishers, 1980)

Referring to the fundamental rights of "Life, Liberty and the pursuit of Happiness" in the United States Declaration of Independence in a letter to Richard Nixon (December 15, 1971). http://www.thehindu.com/thehindu/mag/2005/07/03/stories/2005070300090100.htm.
Source: Management Science (1968), Chapter 7, Automation and Such, p. 177.

Henry Ford and Samuel Crowther (1930). Edison as I Know Him. Cosmopolitan Book Company. p. 15

Interview at the 1990 Australian Grand Prix, November 1990 http://youtube.com/watch?v=9j6dGOGftY4

Letter to Miss Rinder, July 30, 1918
1910s

The Beginning of Time (1996)

Frag. B 2.2-6, quoted by Proclus, Commentary on the Timaeus I, 345

Srimad Bhagavatam, Bhaktivedanta Book Trust, 1999. Canto 7, Chapter 4, verse 5-7, purport. Vedabase http://www.vedabase.com/en/sb/7/4/5-7
Quotes from Books: Loving God, Quotes from Books: Regression of Science

Source: The Mind and the Brain, 1907, p. 27

“That it’s possible not to see a lie even when it’s in front of us.”
Source: All the Names (1997), p. 210

From an appearance in the Discovery Channel program Alien Planet (14 May 2005)

First Memoir. On the Moving Force of Heat and the Laws which may be Deduced Therefrom
The Mechanical Theory of Heat (1867)

<span class="plainlinks"> Foreword, 'Tales of Transformation: English Translation of Tagore's Chitrangada and Chandalika', Lopamudra Banerjee, (2018). https://www.amazon.co.uk/dp/B07DQPD8F4/</span>
From Prose

Suetonius, Divus Augustus, paragraph 28.

Letter to Pope Gregory XV (20 April 1623).
Sir Charles Petrie (ed.), The Letters...of King Charles I (1935), p. 16.

Source: Books, Spiritual Warrior, Volume III: Solace for the Heart in Difficult Times (Hari-Nama Press, 2000), Chapter 8 - How To Strengthen Ourselves

2014, Sixth State of the Union Address (January 2014)

Other

Interview: Chuck Dixon http://www.gothamwdeszczu.com.pl/en/2013/07/04/interview-chuck-dixon/ (July 4, 2013)

Letter to "The Keicomolo"—Kleiner, Cole, and Moe (October 1916), in Selected Letters I, 1911-1924 edited by August Derleth and Donald Wandrei, p. 27
Non-Fiction, Letters

Source: The Foundations of Leninism, Ch.8

Address to the International Committee for the Supreme Soviet of the U.S.S.R. (17 September 1990)
Post-presidency (1989–2004)

Floor Statement on President's Decision to Increase Troops in Iraq (19 January 2007)
2007