Quotes about doubt
page 41

Source: The Subtle Art of Not Giving a F*ck (2016), Chapter 4, “The Value of Suffering” (pp. 77-78)
Source: Grass (1989), Chapter 10 (p. 191)

"The Context for Creating a Transformed World: A World That Works for Everyone." 'Article in 'The Graduate Review (April 1980) by Mary Earle & Neal Rogin.

“However, he had a particular bent for mythology and carried his researches in it to such a ridiculous point that he would test professors of Greek literature – whose society, as I have already mentioned, he cultivated above all others – by asking them questions like: "Who was Hecuba's mother?" – "What name did Achilles assume when he was among the girls?" – "What song did the Sirens sing?"”
Maxime tamen curavit notitiam historiae fabularis usque ad ineptias atque derisum; nam et grammaticos, quod genus hominum praecipue, ut diximus, appetebat, eius modi fere quaestionibus experiebatur: "Quae mater Hecubae, quod Achilli nomen inter virgines fuisset, quid Sirenes cantare sint solitae."
Cf. Thomas Browne, Urn Burial, Ch. V
Source: The Twelve Caesars, Tiberius, Ch. 70
Ted Morgan, Literary Outlaw, discusses Edie Parker's impression of Joan Vollmer:
About
Quoted by Sir Robert Birley in Kurt Hahn: A Life Span in Education and Politics, ed. Herman Röhrs, 1966, tr. 1970, ISBN 0710068859, Foreword, p. xv.
Touchstone Magazine interview (June 2002)
2000s

Source: Mr. Penumbra's 24-Hour Bookstore (2012), Chapter 11 “The Spider” (p. 86; ellipses represent minor elisions of description)

Eagleton v. East India Co. (1802), 3 Bos. and Pull. 67.

The New York Times (10 December 1916) From "Godlessness Mars Most Contemporary Poetry." http://query.nytimes.com/mem/archive-free/pdf?_r=1&res=9A0CE2D7153BE233A25753C1A9649D946796D6CF
John R. Platt (1964). Cited in: William M. Block, M. Dale Strickland, Bret A. Collier, Markus J. Peterson (2008) Wildlife Study Design. Springer. p. 20 among other places.

Concepts

Speech to an audience of around 1,500 people on 23 February 1974 about British membership of the EEC. (Collings, Rex, ed. (1991), Reflections of a Statesman: The Writings and Speeches of Enoch Powell, P. 454).
1970s

Variant translations:
What we possess and what gives us strength is our joy in life, our interest in life in all its amoral facets. This is also the foundation for today's art. We do not even know the aesthetic laws.
We are not disillusioned because we have no illusions; we have never had any. What we have, and what constitutes our strength, is our joy in life, in all of its moral and amoral manifestations.
1940 - 1948, Intimate Banalities' (1941)

Interview with Univision's León Krauze, as quoted in "Bernie Hits Bump on Univision: Speechless on Socialism’s Failures" http://newsbusters.org/blogs/latino/edgard-portela/2016/05/26/bernie-hits-bump-univision-speechless-socialisms-failures by Edgard Portela, NewsBusters (26 May 2016)
2010s, 2016

Prismatic and Diffraction Spectra: Memoirs (1899) Tr. & Ed. J. S. Ames p. 10

Verk, edited by Kletzkin, xi. 277f.

abc.net.au http://www.abc.net.au/7.30/content/2013/s3890402.htm.
2013

Source: Life Itself : A Memoir (2011), Ch. 54 : How I Believe In God

Ibid.
"The Ends of Zionism: Racism and the Palestinian Struggle"

2000s, The Real Abraham Lincoln: A Debate (2002)

All the ride to the hospital I kept bending over him, saying "Jack, Jack, can you hear me, I love you, Jack."
The "Camelot" interview (29 November 1963)

Preface to the First Edition.
The Myth of Mental Illness: Foundations of a Theory of Personal Conduct (1961)

Said in 1936, as quoted in The Ghost in the Little House, prologue, by William V. Holtz (1993).

Superfly.
Song lyrics, Super Fly (1972)

Transcript: Thom Hartmann talks to Chris Hedges about how liberals are a useless lot. 07 Dec '09. http://www.thomhartmann.com/blog/2010/02/transcript-thom-hartmann-talks-chris-hedges-about-how-liberals-are-useless-lot-07-dec-0

Answering the question of Dutch TV station "Nederland 1" and Dutch newspaper "NRC Handelsblad", "Can you imagine a situation in which you would decide to remain in office for a third term?", Putin said: http://web.archive.org/web/20061013003243/http://www.kremlin.ru/eng/speeches/2005/10/31/1955_type82914type82916_96455.shtml
2006- 2010

Marginal note on a report from the London Conference of Ambassadors (December 1912), quoted in Fritz Fischer, Germany's Aims in the First World War (New York: W. W. Norton & Co, 1967), p. 33
1910s

In [Booker, Cory, United: Thoughts on Finding Common Ground and Advancing the Common Good, https://books.google.com/books?id=iFekDQAAQBAJ, 2017, Random House Publishing Group, 978-1-101-96518-4], as quoted in [Yanklowitz, Rabbi Shmuly, Standing Together In the Era of National Division: Review of United by Cory Booker, https://www.huffingtonpost.com/rabbi-shmuly-yanklowitz/standing-together-in-the-_b_9359900.html, 21 August 2018, The Huffington Post, March 3, 2016]
2016

"White Men Sweating" - review of The British in Malaya 1880-1941: The Social History of a European Community in Colonial South-East Asia, by John G. Butcher.
Non-Fiction, Homage to QWERT YUIOP: Selected Journalism 1978-1985 (1986)

Resignation letter http://politics.guardian.co.uk/libdems/story/0,,2191836,00.html, 15 October 2007.

System of Transcendental Philosophy (1800)
1970s, Economics for the Citizen (1978)

At Home With: Esther Williams; Swimming Upstream http://www.nytimes.com/1999/09/02/garden/at-home-with-esther-williams-swimming-upstream.html (September. 2, 1999)

Speech in Manchester (January 1843), quoted in G. M. Trevelyan, The Life of John Bright (London: Constable, 1913), pp. 84-85.
1840s

Address to the Knights of Columbus (5 August 1992) https://www.c-span.org/video/?30685-1/bush-campaign-speech

Conversation with Arthur de Claparède, the Swiss ambassador (10 December 1912), quoted in John Rohl, 'Germany', in Keith Wilson (ed.), Decisions for War 1914 (London: University College London Press, 1995), p. 41
1910s

"6th Foundational Falsehood of Creationism" https://www.youtube.com/watch?v=t3k0dDFxkhM, Youtube (February 2, 2008)
Youtube, Foundational Falsehoods of Creationism

from the First Annual Santa Barbara Lectures on Science and Society, University of California at Santa Barbara (1975)

"Ethan Brand" (1850)

Quote of Breton, from Introduction to the exhibition of Gorky's first show', Julien Levy Gallery', March 1945; as quoted in Arshile Gorky, – Goats on the roof, ed. by Matthew Spender, Ridinghouse, London, 2009, p. 258
after 1930
Source: Natural Right and History (1953), p. 6

Quote of 1906 from a letter; cited in Paul Cézanne, Letters ed. John Rewald, New York, Da Capro Press, 1995, p. 313
Quotes of Paul Cezanne, after 1900

2010s, Update on Investigations in Ferguson (2015)
Source: Constructing the subject: Historical origins of psychological research. 1994, p. vii; Preface.
Source: "English and the Discipline of Ideas" (1920), p. 63

p, 125
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Source: Information and Decision Processes (1960), p. vii

Source: Problems In Genetics (1913), p. 10

and thus is one of the previous two types of problem
Source: Solving Mathematical Problems (2nd ed., 2006), Ch. 1 : Strategies in problem solving

May 2004 http://web.archive.org/web/20001011/www.nationalreview.com/thecorner/04_05_02_corner-archive.asp
2000s, 2004

Before We Bomb Iraq http://www.house.gov/paul/congrec/congrec2002/cr022602.htm (February 26, 2002).
2000s, 2001-2005

“Without question, Steve is the best Broadway lyricist, past or present.”
Source: Arthur Laurents; in Halliwell's Who's Who in the Movies (2001 ed): Art. Stephen Sondheim p. 408

2000s, The Real Abraham Lincoln: A Debate (2002), The Lincoln-Douglas Debates

Source: The Works of the Right Reverend George Horne, 1809, p. 220 ; As quoted in Allibone (1880)

Responding to a question from a Colorado 3rd grader about what the US Vice President does; October 20, 2008. http://www.thestar.com/News/USElection/article/522891
2014
Source: Software Engineering: Principles and Practice, 2007, p. 2

My Reviewers Reviewed (lecture from June 27, 1877, San Francisco, CA)

No Compromise – No Political Trading (1899)

Discours de réception de Louis Pasteur (1882)

Letter to the Archbishop of Cincinnati (10 September 1976) http://www.presidency.ucsb.edu/ws/print.php?pid=6320
1970s

"Ministers and Marches" sermon (1965), Lynchburg, Virginia, quoted in [2008-08-19, Blue Dixie: Awakening the South's Democratic Majority, Bob Moser, New York, Henry Holt, 9780805087710, 16839743M, 173, http://books.google.com/books?id=l8R570Dq60YC&pg=PA173]
also quoted in A Testament of Hope: the essential writings of Martin Luther King (1990) by James M Washington, pub Harper Collins, San Francisco ISBN 0060646918

The No. 1 Ladies' Detective Agency, chapter 1.
The No. 1 Ladies' Detective Agency series

1960s–1970s, A Conversation with Professor Friedrich A. Hayek (1979)

Source: The development of intelligence in children, 1916, p. 37 : lead paragraph of "New Methods for the Diagnosis of the Intellectual Level of Subnormals"

Edward Hall Alderson, counsel employed in opposition to the proposed Liverpool & Manchester Railway. On 25th April, 1825, George Stephenson gave evidence to the House of Commons committee looking into the proposed railway.

Interview on "Panorama", BBC 1 (16 October 1967).
Leader of the Opposition

Remarks by the President to the Press Pool, Nothin' Fancy Cafe, Roswell, New Mexico — Whitehouse Transcript http://georgewbush-whitehouse.archives.gov/news/releases/2004/01/20040122-5.html, Office of the Press Secretary, January 22, 2004.
2000s, 2004

And I want to say tonight, I want to say that I am happy that I didn't sneeze.
1960s, I've Been to the Mountaintop (1968)

Speech at the SNP annual conference (24 September 2004), quoted in The Independent, ' Salmond back with threat to impeach PM http://www.independent.co.uk/news/uk/politics/salmond-back-with-threat-to-impeach-pm-6160873.html' (25 September 2004).

Source: Life Itself : A Memoir (2011), Ch. 54 : How I Believe In God

1860s, Oration at Ravenna, Ohio (1865)

F*** You! Mr. President: Confessions of the Father of the Neutron Bomb (2006)

Labour Party Annual Conference Report 1962, page 159.
Speaking against the Liberal Party's policy of British membership of the European Communities, Labour Party Conference, 2 October 1962.
See the video clip here http://newsvote.bbc.co.uk/1/hi/programmes/the_daily_politics/6967366.stm

Federalist No. 49 (2 February 1788)
1780s, Federalist Papers (1787–1788)