Quotes about doubt
page 11

Voltaire (1916)
Source: The Apophenion (2008), p. 107-108

Review http://www.rogerebert.com/reviews/immortals-2011 of Immortals (9 November 2011)
Reviews, One-and-a-half star reviews
Source: The Root of the Righteous (1955), Chapter 34.

Source: A Man of Law's Tale (1952), On Education, p. 14

He then addressed somebody, "O Unais! go to the wife of this (man) and stone her to death" So, Unais went and stoned her to death.
Narrated Abu Huraira and Zaid bin Khalid Al-Juhani [3, 49, 860]
Sunni Hadith

As quoted in Sam Houston (2004), by James Haley, University of Oklahoma Press, p. 397
1860s

In a letter to Heinrich Wilhelm Matthias Olbers (14 May 1826), defending Chevalier d'Angos against presumption of guilt (by Johann Franz Encke and others), of having falsely claimed to have discovered a comet in 1784; as quoted in Calculus Gems (1992) by George F. Simmons

Possible Worlds and Other Papers (1927), p. 286
Similar remarks that seem derived from this have in recent years been attributed to Arthur Stanley Eddington, as well as to Haldane, but without citations of an original source:
The universe is not only stranger than we imagine, it is stranger than we can imagine.
The world is not only stranger than we imagine, it is stranger than we can imagine.
Not only is the universe stranger than we imagine, it is stranger than we can imagine.

About Khizr M. Khan's speech during the (July 29, 2016)

1920s, Authority and Religious Liberty (1924)

Source: Why We Fail as Christians (1919), p. 88

“Religions do not teach doubt.”
Source: Timescape (1980), Chapter 27 (p. 322)
Source: Attributed in [Nizami, K. A., w:K. A. Nizami, Politics and Society during the Early Medieval Period: Collected Works of Professor Mohammad Habib, 1974, 12]. Later quoted in [Eaton, Richard M., Temple Desecration And Indo-Muslim States, Journal of Islamic Studies, 2000, 11, 3, 283–319, https://www.jstor.org/stable/26198197, 0955-2340] Which was later quoted in [Hirst, Jacqueline Suthren, w:Jacqueline Suthren Hirst, Zavos, John, Religious Traditions in Modern South Asia, Routledge, 978-1-136-62667-8, 239, https://books.google.com/books?id=voGoAgAAQBAJ&pg=PT239, 2013] note: Attributed
Ref: en.wikiquote.org - Mohammad Habib / Attributed

Rudolf E. Kálmán (1972), cited in: Lotfi A. Zadeh " My life and work - a retrospective http://www.cs.berkeley.edu/~zadeh/papers/Preface%20ACM-My%20Life%20and%20Work--A%20Retrospective%20View.pdf" in: Appl. Comput. Math., V.10, N.1, Special Issue, 2011, p. 4-9
The More Beautiful World Our Hearts Know Is Possible. The Vision and Practice of Interbeing (2013)

"Friendship as a Way of Life," interview in Gai pied, April 1981, as translated in Ethics, Subjectivity and Truth (1994), pp. 135-136

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 135.

L'espérance oubliée (1972) [Hope in Time of Abandonment] translated by C. Edward Hopkin (1973)

Letter http://www.darwinproject.ac.uk/letter/entry-12041 to John Fordyce, 7 May 1879
Other letters, notebooks, journal articles, recollected statements

418
1940s–present, Minority Report : H.L. Mencken's Notebooks (1956)

Quoted on The Daily Telegraph (July 30, 2015), "Matthew Hayden fears Australian team culture could be affected by dropping of Brad Haddin" http://www.dailytelegraph.com.au/sport/cricket/matthew-hayden-fears-australian-team-culture-could-be-affected-by-dropping-of-brad-haddin/news-story/08a3e9ac471abf5418d8dd3a34deff82

XVII, 15
The Kitáb-I-Asmá
“Commerce and Culture,” p. 287.
Giants and Dwarfs (1990)

In Esoteric Christianity: Or, The Lesser Mysteries http://books.google.co.in/books?id=XLUipprqQkAC&pg=PT2, p. 2

Source: 1880s, Life and Times of Frederick Douglass (1881), pp. 110–111.
The End of Market Fundamentalism (1999)

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), Human Immortality: its Positive Argument, p.307-8

Foreword : Reflections on A Preface to Democratic Theory
A Preface to Democratic Theory (Expanded ed., 2006)

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

Letter to the President of the English Society for Promoting the Manumission of Slaves http://www.vindicatingthefounders.com/library/jay-to-english-society.html (June 1788).
1780s

Letter to Archbishop of Canterbury (14 October 1940), quoted in Keith Feiling, Neville Chamberlain (London: Macmillan, 1946), p. 455.
Post-Prime Ministerial

TownHall Meeting At Aviano Air Base in Italy (7 February 2003) https://web.archive.org/web/20070114160540/http://www.defenselink.mil/transcripts/2003/t02072003_t0207sdtownhall.html
2000s

Review http://www.rogerebert.com/reviews/humpday-2009 of Humpday (22 July 2009)
Reviews, Three-and-a-half star reviews

“When a man is in doubt what to do, he goes wherever he happens to be first called.”
Kopal-Kundala, Chapter IV: With the Kapálik translated by Henry Arthur Deuteros Phillips (1885)

The Fourteenth Revelation, Chapter 42
The Complete Neurotic's Notebook (1981), Neurotics and neurosis

Page 81
2000s, Promises to Keep (2008)

St. 4
Memorial Verses (1852)

Hawthorne and His Mosses (1850)

As quoted in Gérard de Villiers (1975), The Imperial Shah: An Informal Biography, page 273
Attributed

An Old Chaos: Ichthyophils and Liberals (p. 62)
The Silence of Animals: On Progress and Other Modern Myths (2013)

"Taking Disbelief Out of the Closet", Free Inquiry, 19(3), p. 7, Summer 1999.

Source: "Quotes", The Great Code: The Bible and Literature (1982), Chapter 8, p. 230
Source: Relatives (1973)., Chapter 13 (p. 208).
Preface p. iv-v
A Treatise on Isoperimetrical Problems, and the Calculus of Variations (1810)
The Origins of Modern Science (1957) Introduction

“To give a reason for anything is to breed a doubt of it…”
"On the Difference Between Writing and Speaking"
The Plain Speaker (1826)

In Encyclical Letter Spe Salvi http://www.vatican.va/holy_father/benedict_xvi/encyclicals/documents/hf_ben-xvi_enc_20071130_spe-salvi_en.html (30 November 2007)
2007

Interview with Thomas W. Hazlett in May of 1977, as published in " The Road to Serfdom, Forseeing the Fall", in Reason magazine (July 1992) http://reason.com/archives/1992/07/01/the-road-from-serfdom
1960s–1970s
A Glass Can Only Spill What It Contains.
Brother, Sister (2006)

“Care to our coffin adds a nail, no doubt,
And every grin so merry draws one out.”
Expostulatory Odes, Ode xv; reported in Bartlett's Familiar Quotations, 10th ed. (1919).
Source: The Future As History (1960), Chapter II, Part 7, The Drift Away From Capitalism, p. 94

the Bible
Jude Morte, "Tell It like It is", Manifesto, 2008, p. 71, ISSN 1908-6229.
2008

Speech on the 25th Anniversary of the Announcement of the National Socialist Party's Program http://www.jewishvirtuallibrary.org/adolf-hitler-speech-on-the-25th-anniversary-of-the-announcement-of-the-national-socialist-party-s-program-february-1945 (February 24, 1945)
1940s

Scatter My Ashes http://gregegan.customer.netspace.net.au/HORROR/SCATTER/Scatter.html, published in Interzone (Spring 1988)
Fiction

The Future of Democracy: A Defence Of The Rules Of The Game (1984), Ch. 7: The Rule of Men or the Rule of Law

Letter to George Washington (November 1779)

Cross-correspondences (p. 69)
The Immortalization Commission: The Strange Quest to Cheat Death (2011)

Introduction
Postmodernism: Or, The Cultural Logic of Late Capitalism (1991)

“The past was great no doubt, but I sincerely believe that the future will be more glorious still.”
Pearls of Wisdom

Speech delivered at the second congress of the peace partisans (April 14, 1959).
Principles of the 14th July Revolution (1959)

The Cornerstone Speech (1861)

“Doubt indulged soon becomes doubt realized.”
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 195.

Bernal (1930s) "Labour Monthly Pamphlets, No. 6" (No date). Online ( here http://www.marxists.org/archive/bernal/works/1930s/engels.htm) on Marxists Internet Archive (2008).

2000s, Iraq War speech (2003)

Source: Milennial Dawn, Vol. III: Thy Kingdom Come (1891), p. 160.
Professor A. L. Basham in: Daya Kishan Thussu Communicating India's Soft Power: Buddha to Bollywood https://books.google.co.in/books?id=Ab_QAQAAQBAJ&pg=PA47, Palgrave Macmillan, 24 October 2013, p. 47.

He at the same time assured Mahmood, that to whomsoever he should bequeath the throne at his death, he himself would confirm and support the same.'
Tarikh-i-Firishta, translated into English by John Briggs under the title History of the Rise of the Mahomedan Power in India, 4 Volumes, New Delhi Reprint, 1981. p. 38-49 (Alternative translation: "but the champion of Islam replied with disdain that he did not want his name to go down to posterity as Mahmud the idol-seller (but farosh) instead of Mahmud the breaker-of-idols (but shikan)." in Lal, K. S. (1992). The legacy of Muslim rule in India. New Delhi: Aditya Prakashan. Chapter 3)
Sack of Somnath (1025 CE)
Reason and Rationality (2009)

Speech at the Executive Club of Chicago, December 19, 1941

1963, President John F. Kennedy's last formal speech and public words
An Epic Interview with John Roecker, FilmJerk, www.filmjerk.com, Kristopher, Terrell, August 23, 2003 http://www.filmjerk.com/interviews/article.php?id_int=12,
About

Source: after 2000, Doubt and belief in painting' (2003), p. 41, note 30