Quotes about fool
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Patheos, A Letter to a Certain Christian http://www.patheos.com/blogs/reasonadvocates/2013/10/12/a-letter-to-a-certain-christian/ (October 12, 2013)

“Be wise with speed;
A fool at forty is a fool indeed.”
Satire II, l. 282.
Love of Fame (1725-1728)
“A fine quotation is a diamond on the finger of a man of wit, and a pebble in the hand of a fool.”
Part 1, LXXIV
Meditations of a Parish Priest (1866)

"Fruit Nut"
Apple Venus Volume 1 (1999)

Huffington Post, "Wikileaks Blows Whistle; Most Miss the Point" http://www.huffingtonpost.com/barrett-brown/wikileaks-blows-whistle-o_b_525066.html, 7 April 2010.
A Voice Crying in the Wilderness (Vox Clamantis in Deserto) (1990)

“Who am I to dream?,
dreams are for fools, they let you down…”
Wonderful World
Song lyrics, Undiscovered (James Morrison album) (2006)

“1577. Fools make Feasts, and wise Men eat them.”
Compare Poor Richard's Almanack (1745) : Fools make feasts and wise men eat them.
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)
Unfortunately, we have reached that point.
Source: Into the Buzzsaw: Leading Journalists Expose the Myth of a Free Press., p. 156
Introduction to You Got to Dance With Them What Brung You. Salon.com, The quotable Ivins http://archive.salon.com/people/feature/2000/12/12/ivins_quotes/index.html, Dec. 12, 2000. Retrieved February 1, 2007.

Quoted in "The Butcher of Lyon: The Story of Infamous Nazi Klaus Barbie" - Page 140 - by Brendan Murphy - History - 1983

“Take away that fool’s bauble, the mace.”
Speech dismissing the "Rump Parliament" (20 April 1653)

“We avenge intellect when we dupe a fool, and it is a victory not to be despised”
.
Memoirs (trans. Machen 1894), book 1, Preface http://etext.library.adelaide.edu.au/c/casanova/c33m/preface2.html (We avenge intellect when we dupe a fool, and it is a victory not to be despised [...])
Referenced
Variant: We avenge intelligence when we deceive a fool, and the victory is worth the trouble.

The Lady's New Year's Gift: or Advice to a Daughter (1688)
Source: "The Conduct of Inquiry", p. 35.

Stanley Kunitz (trans.) Story Under Full Sail (New York: Doubleday, 1974) p. 20.

2000s, Welcome to the Big Darkness (2003)
The Philosophical Emperor, a Political Experiment, or, The Progress of a False Position: (1841)
“Her Shield”. p. 181
Poetry and the Age (1953)

Speech to a joint session of the Dail and the Seanad, Dublin, Ireland (28 June 1963)
1963

“I don't believe Fermat had a proof. I think he fooled himself into thinking he had a proof.”
Nova Interview

“One fool at least in every married couple.”
Book IX, ch. 4
Amelia (1751)
“Let a fool hold his tongue and he will pass for a sage.”
Taciturnitas stulto homini pro sapientia est.
Maxim 914
Sentences

II. Main Part : The Unveiling of the Secret.
Parsifal and the Secret of the Graal Unveiled (1914)
“I don't hate fools, I pity them! (I pity the fool)”
Quotes from acting

Sermon 37 "The Nature of Enthusiasm"
Sermons on Several Occasions (1771)

“Fools talk of imitation and copying, all is imitation.”
Quote of Gainsborough in a Letter to John Henderson, 27th June 1773
1770 - 1788

"To the Indianapolis Clergy." The Iconoclast (Indianapolis, IN) (1883)
“I love you because
You're a sweet little fool!”
The sweet little Fool (The Sequel), reported in Bartlett's Familiar Quotations, 10th ed. (1919).

“The aspiring youth that fired the Ephesian dome
Outlives in fame the pious fool that rais'd it.”
Act III, scene 1. Similar thought by Sir Thomas Browne.
Richard III (altered) (1700)
Source: The Mismeasure of Man (1996), p. 36

“To take those fools in clerical garb seriously is to show them too much honor.”
Comment on the Union of Orthodox Rabbis after expelling a rabbi because of his disbelief in God as a personal entity.
Attributed in posthumous publications, Einstein's God (1997)

“Fools learn wisdom through misfortune.”
Source Book in Ancient Philosophy (1907), The Golden Sayings of Democritus
The Pageant of Life (1964), On Income Tax

1912 after return from Japan

Political, Moral, and Miscellaneous Reflections (1750), Moral Thoughts and Reflections

Source: The Foundation series (1951–1993), Foundation and Empire (1952), Chapter 4 “The Emperor; in part I, “The General” originally published as “Dead Hand” in Astounding (April 1945)

On the 22nd Amendment limiting a president to two terms, in a lecture at Columbia University (28 April 1959)

51 Alcibiades
Apophthegms of Kings and Great Commanders

What is the New Element in the Norwegian School?
1890s, Quintessence Of Ibsenism (1891; 1913)

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

Quoted by Owen Myers in The subversive genius of RuPaul http://www.dazeddigital.com/artsandculture/article/24914/1/the-subversive-genius-of-rupaul (2015)
Non-series books, A Flash of Green

“Only gods-damned fools die for lines drawn on maps.”
Source: Red Seas Under Red Skies (2007), Chapter 11 “All Else, Truth” section 5 (p. 513)

Speech to the City of London School (13 June 1924), quoted in On England, and Other Addresses (1926), p. 120.
1924

Letter to J. Edward Austen (1816-07-09) [Letters of Jane Austen -- Brabourne Edition]
Letters

“2144. He that has no Fools, Knaves nor Beggars in his Family, was begot by a Flash of Lightning.”
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

“The fool of nature stood with stupid eyes
And gaping mouth, that testified surprise.”
Source: Fables, Ancient and Modern (1700), Cymon and Iphigenia, Line 107.
The Lottery (1948)

“There are well-dressed foolish ideas just as there are well-dressed fools.”
As quoted in The Cynic's Breviary : Maxims and Anecdotes from Nicolas de Chamfort (1902) as translated by William G. Hutchison, p. 37

“If fools claim that they jumped over six mountains, agree to it. It is not worth fighting over.”
Tripadis

Source: Time Tunnel (1964), Chapter 2 (p. 24).

Interview on The Sound of Young America (September 2011) http://www.maximumfun.org/sound-young-america/george-r-r-martin-author-song-ice-and-fire-series-interview-sound-young-america#transcript
“Teachin' fools some basic rules! (I pity the fool)”
Quotes from acting

Source: The Journal of John Woolman (1774), p. 36; as cited in: Ruth Marie Griffith (2008) American Religions: A Documentary History. p. 137

Volume 2, Ch. 23
Fiction, The Book of the Short Sun (1999–2001)

“A fool and his words are soon parted; a man of genius and his money.”
On Reserve
History of Hindu-Christian Encounters (1996)
Source: Mathematicians are useful (1971), p. 1: Machol explains his definition of systems engineering.

"Virus Strikes Again", Originally "Supply-Side Virus Strikes Again: Why there is no cure for this virulent infection" http://web.mit.edu/krugman/www/virus.html, undated draft at web.mit.edu of a "The Dismal Science" column for Slate
The Accidental Theorist: And Other Dispatches From The Dismal Science (1998)

Thoughts and Aphorisms (1913), Jnana

"Tim Gunn and me" http://latimesblogs.latimes.com/alltherage/2009/11/tim-gunn-and-me.html by Patt Morrison, interview with the Los Angeles Times (23 November 2009).

Magna Carta and Man’s Quest for Freedom, JW.org http://wol.jw.org/en/wol/d/r1/lp-e/102002924?q=Churchill&p=par
Post-war years (1945–1955)

Source: How to Live on Twenty-Four Hours a Day (1910), Chapter 12.

Posted on a website under the alias "RSherman25", quoted in "Richard Sherman Blasts 'Black Lives Matter' Activist" https://web.archive.org/web/20150916235759/http://newsbusters.org/blogs/culture/dylan-gwinn/2015/09/14/richard-sherman-blasts-black-lives-matter-activist (14 September 2015), by Dylan Gwinn, NewsBusters (2015), Reston, Virginia: Media Research Center. Sherman has said that although he agreed with some of the sentiments expressed, he did not write or say this http://www.seattletimes.com/sports/seahawks/video-richard-sherman-speaks-passionately-on-black-lives-matter/.
Misattributed

http://www.ua-football.com/ukrainian/ukrainians/5314b4c0.html