Quotes about doubt
page 33

"Tunku Abdul Rahman last speech" https://www.youtube.com/watch?v=vdoxoum02BA, interview taken on National Day, 1988, Malaysia.

February 1948
Khan Abdul Ghaffar Khan: A True Servant of Humanity by Girdhari Lal Puri pp -188 ? 190

Source: Propaganda & The Ethics Of Persuasion (2002), Chapter One, Why Study Propaganda?, p. 39

October 17-21, 1949
The Kennan Diaries

Dissertation for doctor of philosophy in christian education (May 25, 1991)

Responding to Khaleda Zia's criticism about her state visit to India (13 April 2017). http://m.ndtv.com/world-news/i-hid-nothing-about-india-deals-unlike-khaleda-zia-sheikh-hasina-1680973

Autobiographical Essay (2001)
Source: Growing Up Absurd (1956), p. x.

Comment in early 1933 about Benito Mussolini to U.S. Ambassador to Italy Breckinridge Long, as quoted in Three New Deals : Reflections on Roosevelt's America, Mussolini's Italy, and Hitler's Germany, 1933-1939 (2006) by Wolfgang Schivelbusch, p. 31
1930s

One Minute News (1947), interview with British Pathé's John Parsons
Imagination, Cognition and Personality, review of The Price of Greatness.

Source: One is A Crowd: Reflections of An Individualist (1952), pp. 3-4

2016, Remarks on Donald Trump and the 2016 race
"The spirit of disobedience: an invitation to resistance"

The Quest: History and Meaning in Religion (1969), p. 72.

As quoted in The Ages of Wonder Woman: Essays on the Amazon Princess in Changing Times, edited by Joeph J Darowski, p.7 in the essay "William Marston's Feminist Agenda" by Michelle R. Finn,
Attributed

“Objectivism and the State: An Open Letter to Ayn Rand,” 1969

1960s, Farewell address (1961)

1930s, On my Painting (1938)
Language Education in a Knowledge Context (1980)

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

Quoted in "The Azerbaijani Turks: power and identity under Russian rule" - Page 115 - by Audrey L. Altstadt - History – 1992

In Theoria residiorum biquadraticorum, Commentatio secunda; Werke, Bd. 2 (Goettingen, 1863), p.177. As quoted by Robert Edouard Moritz in Memorabilia mathematica: the philomath's quotation book (1914) p. 282.

Speech in the House of Commons (25 June 1850).
1850s
How to Manage Mom and Dad (November/December 1994)
“[The question for the behavioral disciplines is simply] what is better, and how do we get there?”
Kenneth Boulding (1977) as cited in: Association for Humanist Sociology US (1997) Humanity & society. Vol.21, p. 56
1970s

The Works of Francis J. Grimke (1942), edited by Carter Godwin Woodson, Associated publishers, Incorporated, vol. II, page 252
Prokofiev’s piano sonatas : a guide for the listener and the performer (2008), Preface

Source: The End of Science (1996), p. 66

1920s, The Reign of Law (1925)

“Pity for him who one day looks upon
his inward sphinx and questions it. He is lost.”
Pity for Him Who One Day.
Los Cisnes y Otros Poemas (The Swans and Other Poems) (1905)

“The question was put to him, what hope is; and his answer was, "The dream of a waking man."”
Aristotle, 9.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 5: The Peripatetics

Quoted in "Kumble Calls It A day: Quotes... For and By Kumble..."

An Interview with Dr. Leo Igwe — Founder, Nigerian Humanist Movement (2017)

Speech on Foreign Affairs in the House of Commons http://hansard.millbanksystems.com/commons/1987/apr/07/foreign-affairs (7 April 1987).
1980s
p ix-x
Information and Decision Processes (1960)
Some of My Life

Source: "Institutional Economics," 1931, p. 654

Jadunath Sarkar, History of Aurangzib, Volume III, Calcutta, 1928, pp. 164-67. Quoted in S.R.Goel, The Calcutta Quran Petition (1999) ISBN 9788185990583

Esquire, in the column "The Resident Rock Star: JOHN MAYER" http://www.keepmedia.com/pubs/Esquire/2004/07/01/484084?from=search&criteria=john+mayer (July 1, 2004)
Source: Democracy Ancient And Modern (Second Edition) (1985), Chapter 2, Athenian Demagogues, p. 43

University of Havana address (2005)

"The Psychology Behind Morality" (12 June 2014) http://www.onbeing.org/program/jonathan-haidt-the-psychology-behind-morality/transcript/6347#main_content

Clayton Christensen and Joseph L. Bower. (1996) "Customer power, strategic investment, and the failure of leading firms", Strategic Management Journal, Vol. 17(3), pp. 199 as cited in: C.G. Sandström (2010) A revised perspective on Disruptive Innovation p. 8
1990s

Source: The Intellectual Student’s Guide to Survival (1968), pp. 78-79

Source: Interview with The Daily Telegraph (26 December 2010) http://www.telegraph.co.uk/news/worldnews/europe/france/8225697/National-Fronts-Marine-Le-Pen-to-prove-formidable-rival-to-Nicolas-Sarkozy.html
Source: Facets of Liberty: A Libertarian Primer, (1985), p. 196 (Chapter 23, “The Libertarian Philosophy and Taxation")

As quoted in The Century: A Popular Quarterly (1874) ed. Richard Watson Gilder, Vol. 7, pp. 508-509, https://books.google.com/books?id=ceYGAQAAIAAJ&pg=PA508 "Relations of Mathematics to Physics". Earlier quote without citation in Nature, Volume 8 (1873), page 450.
Also quoted partially in Michael Grossman and Robert Katz, Calculus http://babel.hathitrust.org/cgi/mb?a=listis;c=216746186|Non-Newtonian (1972) p. iv. ISBN 0912938013.

“Did you hear that? I didn't hear anything. Put that question another way.”
Sports Illustrated (August 23, 1982).

But let us hope that such a descendant is in a charitable mood, and might add: "And yet they managed to ask a few of the right questions."
Source: Enigmas and Mysteries (1976), p. 142

About Barack Obama's birth certificate.
2010s, 2011
Source: The Metaphysical Foundations of Modern Physical Science (1925), p. 19

Letter to the Archbishop of Canterbury, Whitgift, criticising the Court of High Commission which was persecuting nonconformists (1 July, 1584).
Conyers Read, Lord Burghley and Queen Elizabeth (London: Jonathan Cape, 1960), p. 295.
"Paul Erdős and the Rise of Statistical Thinking in Elementary Number Theory" https://www.youtube.com/watch?v=5cU0g9dI1S8&t=9m40s (July, 2013) Erdős Centennial Conference, Budapest.

Source: Essays in tektology, 1980, p. 78
“Science is not inevitable; this question is very fruitful indeed.”
In personal correspondence, quoted in Elisabeth Nemeth's chapter "Logical Empiricism and the History and Sociology of Science" in the Cambridge Companion to Logical Empiricism (2007) edited by Alan W. Richardson and Thomas Uebel.

Source: Press briefing http://georgewbush-whitehouse.archives.gov/news/releases/2004/07/20040715-7.html, July 15, 2004

2000s, The Logic of the Colorblind Constitution (2004)
"Hurling Crowbirds at Mockingbars"
Poetry

Vol. V, par. 211
Collected Papers (1931-1958)

Source: A Discourse of Combinations, Alterations, and Aliquot Parts (1685), Ch.II Of Alternations, or the different Change of Order, in any Number of Things proposed.

Press conference at the 2016 Australian Open after semi-final loss to Novak Djokovic, after reporter's suggestion that the victor's dominance may be greater than any other in history due to 'there being no great opponents in the future.' http://www.dailymail.co.uk/news/article-3420985/Cranky-Roger-Federer-loses-reporter-asks-quality-current-players-crushing-defeat-hands-Novak-Djokovic-Australian-Open-semi-final.html
Ridgeway (2013) Meet the 2013 ASA President: Cecilia Ridgeway http://www.asanet.org/cecilia-ridgeway. 2013

Source: The Income Tax: Root of All Evil (1954), pp. 34-35

The Human Predicament: A Way Out? (1985), p. 4
Laura Riding and Robert Graves from "Poetry and Politics", reprinted in The Common Asphodel (London: Hamish Hamilton, 1949)

Molotov said it in 1976 when he was in active retirement.[Molotov, Vyacheslav; Chuev, Felix; Resis, Albert, Molotov remembers: inside Kremlin politics : conversations with Felix Chuev, I.R. Dee, 1993, 1566630274, 20]
Quoted in Leslie Halliwell, Halliwell’s Filmgoers’ Companion ( 1984 http://books.google.com/books?id=SAAqAAAAYAAJ&q=%22Paul+Newman+Acting+is+a+question+of+absorbing+other+people's+personalities+and+adding+some+of+your+own+experience%22&pg=PA3#v=onepage)
Source: Knowing Our Place in the Animal World, p. 63

1840s, Essays: First Series (1841), Self-Reliance
Turning physicists into quantum mechanics (2007)

Mont Saint Michel and Chartres (1904)

[Price, Robert M., w:Robert M. Price, The Quest of the Mythical Jesus, http://www.centerforinquiry.net/jesusproject/articles/the_quest_of_the_mythical_jesus, Jesus Project - Center for Inquiry, Committee for the Scientific Examination of Religion, 28 March 2017] [The Quest of the Mythical Jesus first appeared on the Robert M. Price Myspace page.]

N. Nohria & Rakesh Khurana (2010). "Advancing leadership theory and practice." In N. Nohria & R. Khurana (Eds.), Handbook of leadership theory and practice. Boston, MA: Harvard Business School Press. p. 3
Source: Ten Little Wizards (1988), Chapter 14 (p. 141)
Einstein's Telescope: The Hunt for Dark Matter and Dark Energy in the Universe (2009), Epilogue : Dark Matter and Dark Energy: Keys to the Next Revoution, p. 267

Akbar-Nama of Abul Fazl, translated in Elliot and Dowson, Volume VI, p. 21. Quoted in S. R.Goel, The Calcutta Quran Petition (1999) ISBN 9788185990583

Books, Islam and the West: A Conversation with Bernard Lewis (2006)

Rosser, Yvette C. (Winter 2001). "The Clandestine Curriculum: The Temple of Doom in the Classroom". Education About Asia (Association of Asian Studies) 6 (3).

As quoted in His Brother's Blood: Speeches and Writings, 1838–64 https://books.google.com/books?id=qMEv8DNXVbIC&pg=PA170 (2004), edited by William Frederick Moore and Jane Ann Moore, p. 170
1850s, The Fanaticism of the Democratic Party (February 1859)

John N. Bahcall, quoted in his obituary at CalTech (7 September 2005) http://www.spitzer.caltech.edu/features/articles/20050907.shtml; On the Hubble Space Telescope's capabilities for the advancement of science