Kantian Ethics (2008)
Quotes about doubt
page 26
Source: Where There's a Will: Thoughts on the Good Life (2003), Ch. 11 : Lying

Presidential campaign (April 12, 2015 – 2016), Speech in Warren, Michigan (August 11, 2016)

As quoted in "Jacinda Ardern: It is 'totally unacceptable' to ask women about baby plans" by Anna Bracewell-Worrall, Newshub (2 August 2017) http://www.newshub.co.nz/home/election/2017/08/jacinda-ardern-it-is-totally-unacceptable-to-ask-women-about-baby-plans.html
2017

As quoted in Thaddeus Stevens: Commoner (1882) by E. B. Callender, Ch. VI : Heroic Epoch, p. 113
1860s

Letter to Nele van de Velde ((daughter of Henry van de Velde), from Frauenkirch, 1919/20; as quoted in Letters of the great artists – from Blake to Pollock, Richard Friedenthal, Thames and Hudson, London, 1963, pp. 224-225
1916 - 1919
Source: Personal Destinies: A Philosophy of Ethical Individualism (1976), pp. 9-10
Source: 1940s, The theory of the firm in the last ten Years, 1942, p. 793 cited in: Pedro Garcia Duarte (2010) " A Path through the Wilderness: Time Discounting in Growth Models http://public.econ.duke.edu/~staff/wrkshop_papers/2009-2010_Papers/PGDuarte_Path_Through_Wilderness.pdf"

Speech in the Reichstag (25 February 1918), quoted in W. M. Knight-Patterson, Germany. From Defeat to Conquest 1913-1933 (London: George Allen and Unwin, 1945), pp. 159-160
1910s

And that settled it. The master had spoken.
"What We Owe Our Parasites", speech (June 1968); Free Speech magazine (October and November 1995)
1990s
"The Idea of God" from Essays from Epilogue (Manchester: Carcanet, 2001)

“[R]arely is the question asked: Are… is our children learning?”
Campaign speech http://articles.latimes.com/2000/jan/14/news/mn-53988/2, Florence, South Carolina, (January 11, 2000) Video: http://www.youtube.com/watch?v=-ej7ZEnjSeA&feature=related
2000s, 2000

About strategy starts with identifying changes, and companies taking position (2)
"McKinsey Quarterly interview," 2007

asked if he believes the theory of evolution to be true or false
2000s, 2006-2009

Patheos, A Letter to a Certain Christian http://www.patheos.com/blogs/reasonadvocates/2013/10/12/a-letter-to-a-certain-christian/ (October 12, 2013)

No.17. The Monastery — MARY AVENEL.
Literary Remains

Il y avait un nombre important de questions que je m'étais posées et, comme vous le savez, lorsqu'on se pose vraiment les questions, on donne de meilleures réponses que si l'on se contente de lire les réponses convenues.
explaining how he came to write his textbook on quantum mechanics, in Descente au coeur de la matière, an interview edited by [Stéphane Deligeorges, Le monde quantique, Editions du Seuil, Sciences et Avenir, 1984, 2020089084, 111]
Source: Life, the Truth, and Being Free (2010), p. 148

" How I Work http://web.mit.edu/krugman/www/howiwork.html", American Economist (1993)
How I Work (1993)

[A]ujourd'hui … [i]l est question, pour la première fois depuis l'existence des sociétés, d'organiser un système tout-à-fait nouveau, de remplacer le céleste par le terrestre, le vague par le positif, le poétique par le réel.
L'Industrie, as quoted in L'Ami de la Religion et du Roi: journal ecclésiastique, politique et littéraire, No. 336 (29 October 1817)

Reported in Nutrition Action Healthletter, October 1996 issue; as quoted in J. M. Masson, The Face on Your Plate (New York: Norton & Company, 2009), p. 172

Interview for Hornsey Journal (21 April 1978) http://www.margaretthatcher.org/speeches/displaydocument.asp?docid=103662
Leader of the Opposition

Kurt Lewin (1927). "Gesetz und experiment in der Psychologie" [Law and experiment in psychology]. in: Symposion, Vol 1, p. 375-421. Translated by and cited in: Kurt Kreppner " On the Generation of Data in the Study of Social Interaction1 http://www.scielo.br/pdf/ptp/v17n2/7871.pdf" in: Psicologia: Teoria e Pesquisa Vol 17, nr. 2, p. 109.
1920s

Source: Quoted, The Great Gatsby (1925), ch. 4

The Reconstruction of Nations: Poland, Ukraine, Lithuania, Belarus, 1569-1999 (Yale University Press, 2003)

“If one could always choose the right question, then every answer could be as obvious.”
Midnight Tides (2004)
Source: Henri Cartier-Bresson: Interviews and Conversations, 1951-1998, Photographing Is Nothing, Looking Is Everything! Interview with Philippe Boegner (1989), p. 113

As quoted in "Voices of the New Time" as translated by C. C. Shackford in The Radical Vol. 7 (1870), p. 329

1920s, Second State of the Union Address (1924)

Response to a question from the House Judiciary Committee, which held a hearing to investigate interrogation techniques at Guantánamo Bay (July 2008)

Conference on domestic violence, http://www.maryfonden.dk/en/washington-world-conference-speech (27 February 2012)

… Move your amendments and let us get to business.
Speech in the House of Commons answering Conservative leader Arthur Balfour (12 March 1906), quoted in John Wilson, C.B.: A Life of Sir Henry Campbell-Bannerman (London: Constable, 1973), p. 497
Prime Minister

'Zhazhda peremen' ['Thirst for Change'], Pravda, 24 November 1989, p.4. Source: [Modernity and Ambivalence, Zygmunt Bauman, 68, 2013, John Wiley & Sons, 9780745638119]

In "On Gangubai Hangal by Sabina Sehgal Computer Science & Engineering - University of Washington".

But why do the millions obey?
Peace and the Public Mind (1935)

"Class Struggle on the Desktop"
In the Beginning... was the Command Line (1999)
February 10, 2004
Questions asked at Press Conferences

“The only question with wealth is, what do you do with it?”
Though attributed to John D. Rockefeller, Sr. in I Want to Make Money in the Stock Market : Learn to Begin Investing Without Losing Your Life Savings (2006) by Chris M. Hart, p. 169; this is clearly a statement of his son, John D. Rockefeller, Jr., as quoted in John D. Rockefeller, Jr: A Portrait (1956) by Raymond Blaine Fosdick, p. 189: The only question with wealth is what to do with it. It can be used for evil purposes or it can be an instrumentality for constructive social living.
Misattributed
Philosophy : the basics (Fifth Edition, 2013), Introduction

"Sweden — Ship of fools" (13 October 2014) https://youtube.com/watch/?v=RZsvdg1dkJ4
2014

Source: The structure of social action (1937), p. v; Preface first edition

Peace Utopias (1911)

But generally the positivistic scheme taken from mathematical logic is too narrow in a description of nature which necessarily uses words and concepts that are only vaguely defined.
Physics and Philosophy (1958)

The Differential and Integral Calculus (1836)

in Franz Rosenzweig: His Life and Thought (1961/1998), p. 97
Source: Empiricism, Semantics, and Ontology (1950), Ch. 5. Conclusion
1950, p. 12 (1952, p. 123)
1950s, "What is Semantics?", 1950
5. The Rules of Probability. p. 78.
Understanding Uncertainty (2006)
“Ask spiritual questions with intense integrity, and inspiring answers will surely arrive.”
Esoteric Encyclopedia of Eternal Knowledge

Honorary doctorate acceptance speech, 26 July 2010 http://www.pinknews.co.uk/2010/07/26/be-sceptical-and-daring-peter-tatchells-honorary-doctorate-acceptance-speech/

VentureBeat: "Mary Meeker’s annual valentine to Silicon Valley reminds us tech utopianism is alive and well" https://venturebeat.com/2018/06/15/mary-meekers-annual-valentine-to-silicon-valley-reminds-us-tech-utopianism-is-alive-and-well/ (15 June 2018)

Source: Letters to a Young Scientist (2013), chapter 16, "Searching for New Worlds on Earth", page 177.

25 April 2018 tweet https://twitter.com/pattonoswalt/status/989124477530320896

Quoted in "World Politics in Our Time" - Page 375 - by David C. Jordan - 1970.

Interview With Dennis M. Ritchie, 1999, LinuxFocus.org http://www.linuxfocus.org/English/July1999/article79.html,.
On Unix and Unix-like systems (1999)

Quoted in "Commandant of Auschwitz" (1951)

1920s, Ordered Liberty and World Peace (1924)

Do Books Matter? (ed. Brian Baumfield), ISBN 0705700143, p. 28.
Do Books Matter?
Introduction: Thinking about Politics.
On Politics: A History of Political Thought: From Herodotus to the Present (2012)

You Can Lead an Atheist to Evidence, But You Can't Make Him Think (2009)

Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 58.

"Edgar Lee Masters and Carl Sandburg," Tendencies in Modern American Poetry http://books.google.com/books?id=UgZaAAAAMAAJ (1917).

[I, Isaac, Take Thee, Rebekah: Moving from Romance to Lasting Love, 2005, 9781418515812, http://books.google.com/books?id=lhWCB2v3UlQC&pg=PA29&dq=%22Love+is+as+much+a+question+of+the+will%22, 29]
quoting his brother
2000s

To Webster Hubbell during his interview for Attorney General, 1992, according to Hubbell's book Friends in High Places (1997) http://findarticles.com/p/articles/mi_m2843/is_n2_v22/ai_20562397/
Attributed
Source: Building Entopia - 1975, Chapter 4, Definition of Entopia, p. 49

Nicholls v. Dowding and another (1815), 1 Stark. 81.
Observations on the Trade to Africa, Chart XVI, page 65.
The Commercial and Political Atlas, 3rd Edition

Wedded to the Republicans http://progressive.org/?q=node/805
The Progressive, Unplugged
Ill Fares the Land (2010), Introduction

Dara Ó Briain: Live at the Theatre Royal (2006)

Source: 1910s, Speech in the Reichstag, 21 June 1918, p. 175

Indian contemporary artists have not reached my standard: SH Raza
Source: The Rise of Endymion (1997), Chapter 21 (p. 454)

The Future of Civilization (1938)

Source: Women Can't Hear What Men Don't Say (2000), p. 18.

"Chaucer," http://books.google.com/books?id=LOdNAAAAcAAJ&q=%22The+question+of+common+sense+is+always+what+is+it+good+for+a+question+which+would+abolish+the+rose+and+be+answered+triumphantly+by+the+cabbage%22&pg=PA185#v=onepage North American Review (July 1870) http://books.google.com/books?id=sAVaov3zePMC&q=%22The+question+of+common+sense+is+always+what+is+it+good+for+a+question+which+would+abolish+the+rose+and+be+answered+triumphantly+by+the+cabbage%22&pg=PA173#v=onepage
My Study Windows (1871)
Speech in Upminster http://www.margaretthatcher.org/archive/displaydocument.asp?docid=110604 (22 June 1974)
1970s