Quotes about reason
page 18

1800s, First Inaugural Address (1801)
Source: The Inaugural Speeches and Messages of Thomas Jefferson, Esq.: Late President of the United States: Together with the Inaugural Speech of James Madison, Esq. ...
“If you think about the unthinkable long enough it becomes quite reasonable.”

“If reason ruled the world would history even exist?”

“What Reason weaves, by Passion is undone.”
Source: Essay on Man and Other Poems

“Prejudice, not being founded on reason, cannot be removed by argument.”

Source: Ethan Frome and Other Short Fiction

Letter to Fanny Guillermet (Zurich, 5 September 1918)

On getting to the location of the last scene in the movie.
Mohican Press interview (2005)

Source: Intelligence reframed: Multiple intelligences for the 21st century, 1999, p. 51

Wieland; or, the Transformation (1798)
Into the Buzzsaw: Leading Journalists Expose the Myth of a Free Press.

Source: The Principles of Agriculture, 1844, Section I: The fundamental principles, p. 2.

Source: Why Men Earn More (2005), p. 69.

[Alex Johnson, Palin fires back at media, ‘Washington elite’, http://www.msnbc.msn.com/id/26525268/, MSNBC, 2008-09-04, 2008-09-04]
2008, 2008 Republican National Convention

Though sometimes attributed to Addison, this actually comes from a speech delivered by the Irish lawyer Charles Phillips in 1817, in the case of O'Mullan v. M'Korkill, published in Irish Eloquence: The Speeches of the Celebrated Irish Orators (1834) pp. 91-92.
Misattributed

Cults, Sects and Questions (c. 1979)

Disturbed's David Draiman Offers 'Solution' To Illegal Music Downloading http://www.webcitation.org/64oENbO3B, Blabbermouth.net, 11 July 2003)

Source: The Foundation series (1951–1993), Foundation’s Edge (1982), Chapter 12 “Agent” section 4, p. 226

Paul Monk, Australian Financial Review, cited in: Philip E. Tetlock. Expert Political Judgment: How Good Is It? How Can We Know?, 2015. Back cover.
About

Source: Kritik der zynischen Vernunft [Critique of Cynical Reason] (1983), p. 539

Part 2, 00:13:55
Part 2: "The Virus of Faith", quoted at "The Proper Study of Mankind" blog http://psom.blogspot.com/2006/01/root-of-all-evil-part-2-virus-of-faith.html on January 25, 2006
The Root of All Evil? (January 2006)
The Crosswicks Journal, The Irrational Season (1977)

to the minister of England."
Ireland and America (1846)

Salman Rushdie — Talking with David Frost (1993)

Mont Saint Michel and Chartres (1904)

"David Brooks and the DLC: Best Friends Forever?", AlterNet (3 August 2006) http://web.archive.org/web/20060808224928/http://www.alternet.org/columnists/story/39862/

Pages 92-93.
The Silent State: Secrets, Surveillance and the Myth of British Democracy, 1st Edition
James Rumbaugh in Federico Biancuzzi and Shane Warden eds. (2009) Masterminds of Programming. p. 339; cited in " Quote by James Rumbaugh http://www.ptidej.net/course/cse3009/winter13/resources/james" on ptidej.net. Last updated 2013-04-09 by guehene; Rumbaugh is responding to the question: "What do you think of using UML to generate implementation code?"

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 611.

You Can't Be Neutral on A Moving Train (1994) Ch. 4: "My Name is Freedom": Albany, Georgia

Justification By Faith Alone (1738)

Source: http://americanradioworks.publicradio.org/features/mcdonalds/grandin5.html

Source: Debt: The First 5,000 Years (2011), Chapter Twelve, "1971–The Beginning…", p. 364
Source: The Frontiers of Meaning: Three Informal Lectures on Music (1994), Ch. 2 : How to Become Immortal

The New Novel (1914).

“Words perturb our powers of reason. The only safe words are our own.”
Obituary, The Economist, 27 November 2010, p. 98

Love is Enough (1872), Song III: It Grew Up Without Heeding

Massachusetts Spy (April 29, 1773)(Principle of judicial review. In addition, much like the prohibition of unreasonable searches and seizures under the Fourth Amendment of the US Constitution).

“Mere factual innocence is no reason not to carry out a death sentence properly reached.”
These words, which have been widely attributed to Scalia, do not appear in any of his writings or statements. http://www.snopes.com/scalia-death-penalty-quote He nonetheless remarked in Herrera v. Collins (1993, concurring) that state courts had no obligation to review a death sentence on factual innocence grounds, an opinion that he repeated in In re Davis (2009, dissenting).
Misattributed

Source: The Principles of Science: A Treatise on Logic and Scientific Method (1874) Vol. 1, pp. 257, 260 & 271
Christian Rhetoric: Scraps for a Manifesto
The Atheist's Guide to Reality (2011)

“God's will is the very perfection of all reason.”
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 283.

Source: Simone Weil : An Anthology (1986), Love (1947), p. 270

Source: Principles of Scientific Management, 1911, p. 59.
"Revenge of the Cookie Monster".

Great Books: The Foundation of a Liberal Education (1954)

"Assists" lecture, #10 in the confidential Class VIII series of lectures (3 October 1968).

Black Day In July, Track 3, (mono 45 edit), UNITED ARTISTS 50281, March 1968
Did She Mention My Name? (1968)
The Naked Communist (1958)

Source: The Economic Illusion (1984), Chapter 3, Trade, p. 124
Source: The Bourgeois: Catholicism vs. Capitalism in Eighteenth-Century France (1927), p. 15
The King v. Holt (1793), 5 T. R. 444.

Young Americans for Freedom event, Reagan Ranch, , quoted in

Source: 1940s, Action research and minority problems, 1946, p. 37.
"The Demise of the Demarcation Problem", in Cohen, R.S.; Laudan, L., Physics, Philosophy and Psychoanalysis: Essays in Honor of Adolf Grünbaum (1983)

Diary entry (April 30, 1870) as quoted in Ralph Barton Perry, The Thought and Character of William James, vol. 1, p. 323; Letters of William James, vol. I, p. 147.
1870s

Source: Yoga For People Who Can't Be Bothered To Do It (1993), p. 227

Review http://www.rogerebert.com/reviews/napoleon-dynamite-2004 of Napoleon Dynamite (18 June 2004)
Reviews, One-and-a-half star reviews
Source: 1960s, Conflict and defense: A general theory, 1962, p. 2, partly cited in: Dennis Sandole (1998) A Comprehensive Mapping Of Conflict And Conflict. Resolution: A Three Pillar Approach http://www.gmu.edu/programs/icar/pcs/sandole.htm

Source: Responsibility and Response (1967), p. 49

2010s, Update on Investigations in Ferguson (2015)

Eighth Thesis
Idea for a Universal History from a Cosmopolitan Point of View (1784)
Source: The Wizard of Zao (1978), Chapter 5 (pp. 61-62)