Quotes about doubt
page 9

What we all think; reported in Bartlett's Familiar Quotations, 10th ed. (1919). Compare Browning, Paracelsus: "God! Thou art love! I build my faith on that".

On Coalition Government (1945)
Description of the temple built by Shantidas Jhaveri. Mandelslo’s Travels In Western India (a.d.1638-9) https://archive.org/details/in.ernet.dli.2015.531053 p. 23-25

Address at the International Women's Day Conference (2013)

Speech in the House of Commons (2 March 1790), quoted in Loren Reid, Charles James Fox: A Man for the People (1969), p. 261.
1790s

Johanna Mason, p. 361
The Hunger Games trilogy, Catching Fire (2009)
Source: Autobiography of a Brown Buffalo (1972), p. 92.

“To do anything worthwhile, you will face periods of grinding doubt and fear.”
Website

Posthumous Poems, reported in Bartlett's Familiar Quotations, 10th ed. (1919). Compare: "Where God hath a temple, the Devil will have a chapel", Robert Burton, Anatomy of Melancholy, Part iii, Section 4, Member 1, Subsection 1 .

“In doubt, the quickest way to clear one's mind is to discuss.”
The Education of Henry Adams (1907)

Quote of Henri Moore in his interview with David Silvester, in 'The Sunday Times Magazine', 16 Febr. 1964, pp. 18, 20-22
1955 - 1970
Now I See http://books.google.com/books?id=fEXZAAAAMAAJ&q=%22The+modern+theory+that+you+should+always+treat+the+religious+convictions+of+other+people+with+profound+respect+finds+no+support+in+the+Gospels+Mutual+tolerance+of+religious+views+is+the+product+not+of+faith+but+of+doubt%22&pg=PA101#v=onepage (1933)

Jimmy Carter, diary entry of September 8, 1980. http://www.politico.com/click/stories/1009/carters_celebrity_encounters_page2.html
About

I would bet that the farthest thing from Shakespeare's mind was the question "Is this literature?"
Nobel Banquet Speech
A Voice from the Attic (1960)

Never Give Up! http://www.lib.utexas.edu/epoetry/tupperma.q3c/tupperma.q3c-89.html, l. 1-2.
Ballads for the Times (1851)

Speech http://hansard.millbanksystems.com/lords/1868/jun/26/debate-resumed-second-night in the House of Lords (26 June 1868)
1860s

"Into the Cool: Energy Flow, Thermodynamics and Life", Eric D. Schneider and Dorion Sagan, 2005, p. 323
Attributed

Special Message to Congress on the Burr Conspiracy, declaring his former Vice President an illegal conspirator and a fugitive from justice (22 January 1807)
1800s, Second Presidential Administration (1805-1809)

Conversation with Thomas Jones (22 May 1936), quoted in Thomas Jones, A Diary with Letters. 1931-1950 (Oxford University Press, 1954), p. 204.
1936

I'd mourn the Hopes.
Bartlett's Familiar Quotations, 10th ed. (1919)

“… it would seem that the permanency of the present union [Yugoslavia] is extremely doubtful.”
Ames, Herman V. (1921). "Dalmatia and Adjacent Lands of the Jugo-Slavs". (delivered to the University of Pennsylvania Free Public Lecture Course on April 7, 1920 and published in University Lectures Delivered by Members of the Faculty in the Free Public Lecture Course Volume 7 1919-1920). https://books.google.com/books?id=iW7NAAAAMAAJ

Captain Richard Sharpe, p. 136
Sharpe (Novel Series), Sharpe's Escape (2003)

Defence of Criminals: A Criticism of Morality (1889)

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 270

1870s, Fifth State of the Union Address (1873)

In a letter to Claude Monet, 1880; quoted by Geffroy: Claude Monet, vol. I, p. 175; as quoted by John Rewald, in Georges Seurat', a monograph https://ia800607.us.archive.org/23/items/georges00rewa/georges00rewa.pdf; Wittenborn and Compagny, New York, 1943. p. 15
In 1880 an exhibition of the works of Claude Monet had - as Signac was to say later - 'decided his career,' - and after his first efforts as an impressionist Signac had ventured to appeal to Monet, writing him this sentence in his letter

Address to the United Nations (26 September 2012)
Crisis in Syria

Other

Source: Pakistan or The Partition of India (1946), pp. 65

Speech to the Federation of Conservative Students in Manchester (6 October 1981), quoted in The Times (7 October 1981), p. 6. Margaret Thatcher had read Heath's advance text and responded http://www.margaretthatcher.org/document/104712 by saying that "To me consensus seems to be—the process of abandoning all beliefs, principles, values and policies in search of something in which no-one believes, but to which no-one objects".
Post-Prime Ministerial
Source: Growing Up Absurd (1956), p. 154.

Radio Interview, 1960. Quoted in South-East Asia: A Political Profile, Damien Kingsbury (2001, p. 337)
1960s

The Right Must Win. Compare: "That right was right, and there he would abide", George Crabbe, Tales, Tale xv, "The Squire and the Priest".
Bartlett's Familiar Quotations, 10th ed. (1919)

Source: The Philosopher's Apprentice (2008), Chapter 1 (p. 8)
Thought Reform Exists: Organized, Programmatic Influence http://www.csj.org/infoserv_articles/singer_margaret_thoughtreform.htm, Margaret Thaler Singer, Ph.D., The Cult Observer, Vol. 11 No. 6 1994.
1990s

referring to Arthur Balfour's A Fragment on Progress https://books.google.com/books?id=voxJAAAAYAAJ (1891)
The Idea of Progress: An Inquiry Into Its Origin and Growth (1921)

Source: The Confessions of Aleister Crowley (1929), Ch. 5.
All for Australia (1984)

1860s, Oration at Ravenna, Ohio (1865)

“He who shall teach the child to doubt
The rotting grave shall ne'er get out.”
Source: 1800s, Auguries of Innocence (1803), Line 87
Source: The Christian Agnostic (1965), p.231

Source: Remarks to the National Press Club (9 January 2007), as quoted in "Official: First wave of troops to Iraq by Jan. 30" at MSNBC (9 January 2007) http://www.msnbc.msn.com/id/16546093/

‘Hypothesis and Imagination’ in The Art of the Soluble, 1967.
1960s
Mohammad Mujeeb, The Indian Muslims (London, 1967), pp.67-68. quoted from Lal, K. S. (1990). Indian muslims: Who are they.
The Never-Ending Wrong (1977)

Source: 1970s-1980s, The Limits Of Organization (1974), Chapter 1, Rationality: Individual And Social, p. 23

1840s, On the Concept of Irony with Continual Reference to Socrates (1841)
"Rethinking the Role of Fiscal Policy" (2009).

On the scientific revolution of the second half of the 19th century, in [Life and Scientific Work of Peter Guthrie Tait: supplementing the two volumes of Scientific papers published in 1898 and 1900, Cambridge University Press, 1911, 1]
Source: Truth and Truthfulness (2002), p. 6

Calvin to the Foreigners’ Church in London, 1552-10-27, in George Cornelius Gorham, Gleanings of a few scattered ears, during the period of Reformation in England and of the times immediately succeeding : A.D. 1533 to A.D. 1588 http://books.google.com/books?vid=0bbTMcT6wXFWRHGP&id=esICAAAAQAAJ&printsec=titlepage&dq=%22george+cornelius+gorham%22 (London: Bell and Daldy, 1857), p. 285.

“Faith which does not doubt is dead faith.”
Fe que no duda es fe muerta.
La Agonía del Cristianismo (The Agony of Christianity) (1931)

Brown : The Last Discovery of America (2003)

Stella Vine blog, http://web.archive.org/20060421143212/stellavine.blogspot.com/2006/03/harry-pye.html 2006-03-11
On ambition and creative drive.

As quoted in "U.S. Goalkeeper Faces Difficult Save" http://www.nytimes.com/2008/05/25/sports/soccer/25goalie.html?pagewanted=print, The New York Times (May 25, 2008).
2000s

Page 143
Publications, The Shah's Story (1980), On world leaders and statesmen

Letter to Rev. John Fisher (23 October 1821), as quoted in Leslie Parris and Ian Fleming-Williams, Constable (Tate Gallery Publications, London, 1993), p. 229 and also in Richard Friedenthal, Letters of the great artists – from Blake to Pollock (Thames and Hudson, London, 1963), p. 42
1820s

The People's Rights [1909] (London: Jonathan Cape, 1970), pp. 65-66
Early career years (1898–1929)

Source: Winds of Doctrine: Studies in Contemporary Opinion (1913), p. 199

Letter to Marin Mersenne (end of Feb., 1634) as quoted by Amir Aczel, Pendulum: Leon Foucault and the Triumph of Science (2003)

I was relieved.
Source: Final Analysis (1990), p. 193
Introduction
Thomism: The Philosophy of Thomas Aquinas

reprinted in 'Zero', ed. Otto Piene and Heinz Mack, Cambridge, Mass; MIT Press 1973, p. 120
Quotes, 1960's, untitled statements in 'Zero 3', (1961)
Source: Lectures on Teaching, (1906), pp. 267-268.

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 599.

Introducing Barack Obama in College Green, he later denied plagiarism despite 36 of his first 48 words being the exact same as an earlier speech by Obama. Irish Central http://www.irishcentral.com/news/Enda-Kenny-denies-plagiarizing-Barack-Obama-speech-from-2008-122512474.html
2010s

Lord Bolingbroke's Philosophical Works http://books.google.com/books?id=E6ATAAAAQAAJ (1754) Vol.III, Essay IV, Sect XVI

Smuts to C. P. Scott on the Treaty of Versailles, 26 June 1919, as cited in Antony Lentin, 2010, Jan Smuts – Man of courage and vision, p. xvi. ISBN 978-1-86842-390-3

Lord Mayor's Banquet at Guildhall (12 November 1990) http://www.margaretthatcher.org/speeches/displaydocument.asp?docid=108241
Third term as Prime Minister

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), The Harmony of Determinism and Freedom, p.334-5

Presidential campaign (April 12, 2015 – 2016), First presidential debate (September 26, 2016)

Constitutional Government in the United States, New York: NY, Columbia University Press, (1908) p. 16.
1900s
The Puritan Mind (1930) p. 98.

The Last Good Campaign, 2008-10-12, Thurston Clarke, 2008, June, Vanity Fair Online http://www.vanityfair.com/politics/features/2008/06/rfk_excerpt200806?currentPage=4,
Said when asked if he thought Robert F. Kennedy could win the Democratic nomination for President in 1968, comparing Kennedy to Judas Iscariot.

1970s, Proclamation 4417 (1976)