Source: Group Theory in the Bedroom (2008), Chapter 12, Group Theory In The Bedroom, p. 229
Quotes about disappointment
page 4

Letter (16 February 1931), quoted in Birkenhead, Halifax (Hamish Hamilton, 1965), p. 296
Viceroy of India

“It is funny, but I’m disappointed that it accentuates the shallow.”
Remarks on "Kernel mentor", an Everybody loves Eric Raymond internet cartoon (17 May 2005) http://geekz.co.uk/lovesraymond/archive/kernel-mentor in which he is depicted stating "GNU's not understood by everyone, Linus."
2000s

Source: 1910s, An Introduction to Mathematics (1911), ch. 1.
Source: The Frontiers of Meaning: Three Informal Lectures on Music (1994), Ch. 1 : The Frontiers of Nonsense

Thilanga Sumathipala on Mahela being a coaching consultant for England, quoted on The Guardian, "Kumar Sangakkara: England made smart move on mentor Mahela Jayawardene" http://www.theguardian.com/sport/2016/mar/13/kumar-sangakkara-england-mahela-jayawardene-world-twenty20-sri-lanka, March 13, 2016.
About
"Reengineering work: don't automate, obliterate," 1990
Review http://www.reelviews.net/movies/m/mission.html of Mission: Impossible (1996).
Two-and-a-half star reviews

No.15. Ivanhoe — REBECCA.
Literary Remains

“I'm so disappointed that they came with their Eurotrash game.”
http://www.nj.com/olympics/index.ssf/2010/02/nbcs_mike_milbury_uses_eurotra.html
On the 2010 Olympic Russian Team

“The only difference between disappointment and depression is your level of commitment.”
Tickets Still Available (2006)
Variant: I think, in most cases, the difference between depression and disappointment is your level of commitment.

2014
http://www.blastr.com/2014-9-12/grant-morrisons-big-talk-getting-deep-writer-annihilator-multiversity
On life

Patheos, Weighing in on Godzilla http://www.patheos.com/blogs/reasonadvocates/2014/06/08/weighing-in-on-godzilla/ (June 8, 2014)

http://www.cc.com/video-clips/2ufif7/comedy-central-presents-bipolar-coaster
Comedy Central Presents (2007)
Lives of Wives (London: Cassell, 1939)

The Princess Zoubaroff, Act I, sc. iv (1920), cited from Steven Moore (ed.) Complete Plays (Normal, Ill.: Dalkey Archive Press, 1994) p. 55.

2 July 2013 http://www.kildarestreet.com/sendebates/?id=2013-07-02a.8&s=speaker%3A210#g52

Fore-knowledge of Death
The Note-Books of Samuel Butler (1912), Part XXIII - Death

Source: "Remarks in New York City to the National Convention of the Catholic Youth Organization (463)," (15 November 1963) http://www.jfklibrary.org/Research/Research-Aids/Ready-Reference/JFK-Quotations.aspx

Introduction to Maugham's Malaysian Stories (1969)
People, Joseph Conrad, W. Somerset Maugham

Source: Zuleika Dobson http://www.gutenberg.org/dirs/etext99/zdbsn11.txt (1911), Ch. VII

Making liberal men and women : public criticism of present-day education, the new paganism, the university, politics and religion https://archive.org/stream/makingliberalmen00butluoft/makingliberalmen00butluoft_djvu.txt (1921)

Resignation letter to Gladstone (12 July 1882), quoted in G. M. Trevelyan, The Life of John Bright (London: Constable, 1913), p. 433.
1880s
Broken Lights Letters 1951-59.
Karma yoga
Source: The Teachings of Babaji, 4 February 1984.

TV Series and Specials (Includes DVDs), Trick of the Mind (2004–2006)

NME; reported in " In quotes: Keith Richards http://news.bbc.co.uk/1/hi/entertainment/6526133.stm", BBC (April 4, 2007).

Remark made at a National Woman's Rights Convention in Cincinnati, Ohio. (1855) as quoted in Feminism: The Essential Historical Writings (1972) by Miriam Schnier

Narendra Modi, Swarajya Interviews Prime Minister Modi, Interview, R Jagannathan- Jul 02, 2018 https://swarajyamag.com/economy/swarajya-interviews-prime-minister-modi-the-state-of-indian-economy
2018

"Roger writes to readers" Chicago Sun Times (11 October 2006) http://www.rogerebert.com/interviews/roger-writes-to-readers

“Many times, God speaks blessing and breakthrough through pain and disappointment.”
Message to Tanzanian Presidential candidate Edward Lowassa - "VIDEO - Accept Election Results, TB Joshua Urges Tanzanian Opposition Leader" http://www.pmnewsnigeria.com/2015/11/08/video-accept-election-results-tb-joshua-urges-tanzanian-opposition-leader/ PM News, Nigeria (November 8 2015)

“Suspense is worse than disappointment.”
Letter to Thomas Sloan, (1 September 1791)

Main Street and Other Poems (1917), Apology

Letter to George Washington (September 1778)

From Her Books, I Have Chosen To Stay And Fight, HATING ONESELF

Letter to General James Henry Carleton (May 17, 1864)
Source: The Human Side of Enterprise (1960), p. 17 (2006: 24)
"An Essay on a Pig Roast", p. 437
Bully for Brontosaurus (1991)
"The Face of Miranda", p. 496
Bully for Brontosaurus (1991)

Mundane Magic http://lesswrong.com/lw/ve/mundane_magic/(October 2008)

Prayer http://www.walden.org/Institute/thoreau/writings/poetry/Great%20God.htm, st. 1 (1842)

"The Fragility of Liberalism and its Political Consequences in Democratized Korea" (2009)

On his motivation to treat leprosy patients, Page=9
Baba Amte: A Vision of New India

“It is my greatest year, but my biggest disappointment.”
Assessing his 1967 season, as quoted in "Roberto Clemente—Baseball's Brightest Superstar" https://books.google.com/books?id=7LsdgvCy-S4C&pg=PA24 by Arnold Hano, in Boy's Life (March 1968), pp. 25 and 54
Baseball-related, <big><big>1960s</big></big>, <big>1968</big>
Source: The American Business Cycle, 1986, p. 1-2

“Botany is the school for patience, and it’s amateurs learn resignation from daily disappointments.”
Thomas Jefferson, in letter to Madame de Tessé (25 Apr 1788). In Thomas Jefferson Correspondence: Printed from the Originals (1916), 7.
Posthumous publications, On botany

INTERVIEW BY MARC SHAPIRO https://www.pleasence.com/articles/MADMAN.HTML (February 1989)

Reporter waiting to be arrested on cycle-path (a woman jogger had been arrested and cautioned earlier that week)
From PM and Broadcasting House

Source: 1880s, Incidents and Anecdotes of the Civil War (1885), p. 56

An Appeal to the Young (1880)

Larry Fessenden https://film.avclub.com/larry-fessenden-1798217556 (January 19, 2014)

Train In The Distance
Song lyrics, Hearts and Bones (1983)

Twilight.
Lyrics, From a Basement on the Hill (posthumous, 2004)

Jon Stewart to Chris Wallace, Fox News Interview June 19, 2011

Source: A Man of Law's Tale (1952), In London, p. 291

Screenwipe S4E4
Discussing the High School Musical series
Screenwipe
In the song Mãe de Traficante http://www.vagalume.com.br/mc-daleste/mae-de-traficante.html

translation from original Dutch text: Fons Heijnsbroek
version in original Dutch (citaat uit de brief van Jozef Israëls, in het Nederlands): God God zal ik nog eenmaal als een waarachtig kunstenaar tot u keeren. Zullen nog eenmaal al die Kunstminnaren mijne werken met eerbied aanschouwen en de lauwer der Kunst mijn schedel sieren.. .Ik voel zo vurig al het schoone mijner edele loopbaan.. .Ach nogmaals roep ik tot u, laat mij veel liever niet leven dan in mijne gevoelen teleurgesteld te worden.
In a letter of Jozef Israels from Amsterdam, 16 July 1843, to his friend in Groningen, pharmacist Essingh; from RKD: Archive, A.S. Kok, The Hague
Quotes of Jozef Israels, 1840 - 1870
On the advantage of facing doubt when one has discovered something new. Speech at the Nobel Banquet, December 10, 1986 http://nobelprize.org/nobel_prizes/physics/laureates/1986/ruska-speech.html.

Remarks after losing to the Pittsburgh Steelers http://scores.espn.go.com/nfl/recap?gameId=221013004 13 October 2002.

I howled for the woman I loved... and she howled back - British wolfman tells how his obsession drove away the love of his life http://www.dailymail.co.uk/sciencetech/article-1245507/I-howled-woman-I-loved--howled--British-wolfman-tells-obsession-drove-away-love-life.html, Daily Mail, (23 January, 2010)

Source: Dictionary of Burning Words of Brilliant Writers, P. 150.

Speech http://hansard.millbanksystems.com/commons/1932/feb/04/import-duties in the House of Commons (4 February 1932) introducing the Import Duties Act 1932.
Chancellor of the Exchequer

“The Brilliant Epoch” http://www.schulzian.net/translation/sanatorium/epoch1.htm
His father, Living things
"Only Nixon," http://www.ncc-1776.org/tle2008/tle492-20081109-02.html 9 November 2008.

Source: Barsk: The Elephants' Graveyard (2015), Chapter 38, “Loose Ends” (pp. 362-363; ellipses represent elisions of descriptive sections)

Review http://www.rogerebert.com/reviews/garfield-a-tail-of-two-kitties-2006 of Garfield: A Tail of Two Kitties, written in the first person as Garfield. (16 June 2006)
Reviews, Three star reviews
Speech in Upminster http://www.margaretthatcher.org/archive/displaydocument.asp?docid=110604 (22 June 1974)
1970s

“A lot of spiritual gains come through pain, hurt, struggle, confusion and disappointment.”
Too Busy Not to Pray (2008, InterVarsity Press)