Quotes about opinion
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1 Cababe & Ellis' Q. B. D. Rep. 134.
Reg. v. Ramsey (1883)

“Even opinion is of force enough to make itself to be espoused at the expense of life.”
Book I, Ch. 40. Of Good and Evil
Essais (1595), Bartlett's Familiar Quotations, 10th ed. (1919)

“Opinions, yes; convictions, no. That is the point of departure for an intellectual pride.”
Anathemas and Admirations (1987)
“Medical opinions differed as to the cause of this "humor" disease.”
Planet Without Laughter (1980) http://www-cs-faculty.stanford.edu/~knuth/smullyan.html
“Western Civ,” p. 18.
Giants and Dwarfs (1990)

As quoted by William A. DeGregorio, The Complete Book of U.S. Presidents (1984) p. 133

“A change of opinions is almost unknown in an elderly military man.”
A Utopia of Usurers (1917)

version in original Flemish (citaat van Roger Raveel, in het Vlaams): ..Ik wil geen predikant zijn die de wereld wil verbeteren volgens zijn eigen opinie. Daarvoor denk ik te relatief en wellicht ben ik onafhankelijker en ga ik niet zozeer uit van een reflex op de traditie en op de sociale en politieke structuren maar veeleer uit een steeds opnieuw tasten naar het wezen der dingen.
Quote of Raveel in the catalogue of his exhibition in the museum of Deinze in 1972; as cited by Ludo Bekkers in 'Roger Raveel en zijn keuze uit het Museum voor Schone Kunsten in Gent' http://www.tento.be/sites/default/files/tijdschrift/pdf/OKV1975/Roger%20Raveel%20en%20zijn%20keuze%20uit%20het%20Museum%20voor%20Schone%20Kunsten%20in%20Gent.pdf, in Dutch art-magazine 'Openbaar Kunstbezit', Jan/Maart 1975, p. 5
1970's

Reg. v. Bradlaugh and others (1883), 15 Cox, C.C. 230.

Speech to the Economic Students' Union at the School of Economics and Political Science, London (14 December 1900), quoted in The Times (17 December 1900), p. 13.
1900s

As quoted in "Interview with Shepard Smith" https://web.archive.org/web/20120501134518/http://www.esquire.com/features/shepard-smith-fox-news-0309-2 (February 10, 2009), by Tom Junod, Esquire, Hearst Communications Inc.
2000s

life is not what is said but the saying of it, not the picture but the picturing
Quotes from Notes, 1989; as cited on collected quotes on the website of Gerhard Richter: 'on Techniques' https://www.gerhard-richter.com/en/quotes/techniques-5
1980's

Strategic objectives of new Government (May 23, 2007)

Ghoshal thoughts about marriage http://timesofindia.indiatimes.com/entertainment/hindi/music/news/I-like-my-father-being-the-boss-in-my-life-Shreya/articleshow/27854121.cms

Source: An Essay on Aristocratic Radicalism (1889), pp. 25-26

Perhaps this is the defensive solidarity to which Richard Wright refers. If so, it is a reaction I understand, but resolutely decline to follow.
1990s, I Am a Man, a Black Man, an American (1998)

Thomas Jones, Lloyd George (London: Oxford University Press, 1951), p. 178.
About

Bjartur talking with Asta Sollilja
Sjálfstætt fólk (Independent People) (1935), Book Two, Part III: Conclusion

From Is Capital Income? (1921) by George H. Earle, Jr.

Source: The Geological Evidences of the Antiquity of Man (1863), Ch.21, p. 417-418

Grundlagen einer allgemeinen Mannigfaltigkeitslehre [Foundations of a General Theory of Aggregates] (1883)

In an interview with Fox & Friends. http://www.politico.com/story/2015/12/trump-kill-isil-families-216343 (December 2, 2015)
2010s, 2015

1770s, Declaration of Independence (1776)

“Freedom rings where opinions clash.”
Variations of this quote are often attributed to Stevenson without a date or location for the remark. Two early occurrences are in a Congressional hearing on November 13, 1985, where Stevenson was quoted by Representative Ted Weiss ("Limits on the Dissemination of Information by the Department of Education" (1986), published by the GPO); and an article dated June 4, 1989 by Sue Ann Wood in the St. Louis Post-Dispatch ("Write Editor, Readers Urged"). No source closer to Stevenson has been found.
Disputed

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 2.

2010s, 2011, Speech at the Gerald R. Ford Foundation (2011)

Source: PTI "Sania for change of attitude towards women in sports"
Source: A Soldier's Story (1951), p. viii

Letter to Georg Brandes (9 January 1906), quoted in David Robin Watson, Georges Clemenceau: A Political Biography (London: Eyre Methuen, 1974), pp. 220-221.
Source: "Attribution theory in social psychology." 1967, p. 226; as cited in: Yaacov Trope, "Inferential processes in the forced compliance situation: A Bayesian analysis." Journal of Experimental Social Psychology 10.1 (1974): 1-16.

1780s, Letter to Alexander Hamilton (1788)

My Life and Confessions, for Philippine, 1786

Diary (17 February 1882)
Diary and Letters of Rutherford Birchard Hayes (1922 - 1926)

regarding the Sandy Hook Elementary School shooting
2012-12-17
Dr. James Dobson's Family Talk
Radio
http://www.drjamesdobson.org/Broadcasts/Broadcast?i=32d0ea7c-eeb2-41fb-9c05-f6e0c733d58a, quoted in * 2012-12-17
Dobson: Connecticut Shooting was God Allowing 'Judgment to Fall Upon Us' for Turning Our Back on Him
Kyle Mantyla
Right Wing Watch
http://www.rightwingwatch.org/content/dobson-connecticut-shooting-was-god-allowing-judgment-fall-upon-us-turning-our-back-him
2012

“Opinion is a light, vain, crude, and imperfect thing.”
The Works of Ben Jonson, Second Folio (1640), Timber: or Discoveries

p. 82 of How Much Can We Boost IQ and Scholastic Achievement? (1969) https://en.wikipedia.org/wiki/How_Much_Can_We_Boost_IQ_and_Scholastic_Achievement%3F, the invited paper that created much hostility towards Jensen.

Paul A. Freund, Proceedings in Memory of Mr. Justice Brandeis, 317 U.S. ix, xix–xx (1942).

“He that complies against his will.
Is of his own opinion still.”
Canto III, line 547. Sometimes misreported as "is convinced" instead of "complies"; reported in Paul F. Boller, Jr., and John George, They Never Said It: A Book of Fake Quotes, Misquotes, & Misleading Attributions (1989), p. 11
Source: Hudibras, Part III (1678)

“He loved his kind, but sought the love of few,
And valued old opinions more than new.”
Infatuation.

"Geert Wilders: an interview with the Netherlands' controversial politician." http://www.thefreelibrary.com/Geert+Wilders%3A+an+interview+with+the+Netherlands'+controversial...-a0205111713 Contemporary Review (22 March 2009)
2000s

1920s, The Press Under a Free Government (1925)
Hayek's Journey: The Mind of Friedrich Hayek (2003)

“Under democracy individual liberty of opinion and action is jealously guarded.”
Young India (2 March 1922)
1920s

Speech http://hansard.millbanksystems.com/lords/1839/mar/14/corn-laws in the House of Lords (14 March 1839) in favour of the Corn Laws.

Speech in the House of Commons (26 March 1794), reported in The Parliamentary History of England, from the Earliest Period to the Year 1803. Vol. XXXI (London: 1818), pp. 94-95.
1790s

1894 speech on patriotism to Union veterans of the Civil War, [McClarey, Donald R, Father John Ireland and the Fifth Minnesota, The American Catholic, 2012-08-23, https://the-american-catholic.com/2012/08/23/father-john-ireland-and-the-fifth-minnesota/, 2018-02-04]

Source: Means and Ends of Education (1895), Chapter 1 "Truth and Love"
Variant in other editions: Do not think of knocking out another person's brains, because he differs in opinion from you; it will be as rational to knock yourself on the head because you differ from what you thought ten years ago.
The Dignity of Human Nature (1754)
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 451.
Source: Persecution and the Art of Writing (1952), Persecution and the Art of Writing, p. 35

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)

"The Office of the People in Art, Government and Religion" (1835), p. 421
Literary and Historical Miscellanies (1855)

On McCain campaign advisor and former HP CEO Carly Fiorina's presenting mandatory birth control coverage as McCain's own position: "Many health insurance plans cover Viagra, but won‘t cover birth control medications. Those women would like a choice." http://www.msnbc.msn.com/id/25639007/
2000s, 2008

Yvor Winters Uncollected Essays and Reviews (Chicago: Swallow Press, 1973) p. 139.
Criticism

The exigencies of the drive to originality can, as Valéry understood, promote a deep uncertainty about one's personal value. If one is a product, is it new enough? Perfect? One of a kind?
New York City (p. 259).
States of Desire: Travels in Gay America (1980)

p, 125
Astronomical Observations relating to the Construction of the Heavens... (1811)

Letter published in The Philosophical Magazine (1817-03-13)

British Cavalry, The Anglo-Saxon Review, March 1901.
Reproduced in The Collected Essays of Sir Winston Churchill, Vol I, Churchill at War, Centenary Edition (1976), Library of Imperial History, p. 60.
Early career years (1898–1929)

Letter to William Findley, Washington (21 March 1801); published in Thomas Jefferson - A chronology of his thoughts (2002) by Jerry Holmes, p. 175 http://books.google.de/books?id=iOHNKGJGo94C&pg=PA175&lpg=PA175&dq=It+is+rare+that+the+public+sentiment+decides+immorally+or+unwisely,+and+the+individual+who+differs+from+it+ought+to+distrust+and+examine+well+his+own+opinion&source=bl&ots=lUHnglNeTO&sig=OfEnoz8qmlxJq-5jIEvC8dD1hOk&hl=de&sa=X&ei=V_zAUPqeCsjGtAaZ-YGYDQ&ved=0CEMQ6AEwAzgK#v=onepage&q=It%20is%20rare%20that%20the%20public%20sentiment%20decides%20immorally%20or%20unwisely%2C%20and%20the%20individual%20who%20differs%20from%20it%20ought%20to%20distrust%20and%20examine%20well%20his%20own%20opinion&f=false
1800s, First Presidential Administration (1801–1805)
“…Complains that his son has a low opinion of business; attributes this to ´reverse snobbery”
Business Adventures: Twelve Classic Tales from the World of Wall Street

The Sun has a dimmer switch? http://wattsupwiththat.com/2007/02/06/the-sun-has-a-dimmer-switch/, wattsupwiththat.com, February 6, 2007.
2007
Source: Democracy Ancient And Modern (Second Edition) (1985), Chapter 1, Leaders and Followers, p. 3

Qui baise feme et plus n'i fait,
Des qu'il sont sol a sol andui,
Dont quit je qu'il remaint en lui.
Feme qui se bouche abandone
Le sorplus molt de legier done.
Source: Perceval or Le Conte du Graal, Line 3860.

Gordon Ball (1977), Journals: Early Fifties Early Sixties, Grove Press NY
Journals: Early Fifties Early Sixties

Paul Kurtz (1983) In defense of secular humanism, p. 16
“It is my considered opinion that the sweetest relief from suffering and the best comfort in affliction that this world affords are to be found almost entirely in the study of literature, and so I believe that the splendour of historical writing is to be cherished with the greatest delight and given the pre-eminent and most glorious position.”
Cum in omni fere litterarum studio dulce laboris lenimen et summum doloris solamen dum uiuitur insitum considerem, tum delectabilius et maioris praerogatiua claritatis historiarum splendorem amplectendum crediderim.
Prologue, pp. 2-3.
Historia Anglorum (The History of the English People)

The Election in November 1860 (1860)

Letter to Lawrence Crawford (10 March 1643)

2011-01-04
O'Reilly Debates Atheist Group President Over Religions Are 'Scams' Billboard
The O'Reilly Factor
Fox News
Television
http://www.foxnews.com/on-air/oreilly/transcript/o039reilly-debates-atheist-group-president-over-religions-are-039scams039-billboard
interviewed regarding American Atheists' Huntsville, Alabama "You Know They're All Scams" billboard

2000s, The Central Idea (2006)

Speech (9 November 1978), as quoted in The Most Truthful Individual in Recent History" in Iranshenasi, Vol. XIV, No. 4 (Winter 2003), as translated by Farhad Mafie
Foreign policy

Journal Intime (1882), Quotes used in the Introduction by Ward
Context: Ought I not to have been more careful to win the good opinion of others, more determined to conquer their hostility or indifference? It would have been a joy to me to be smiled upon, loved, encouraged, welcomed, and to obtain what I was so ready to give, kindness and goodwill. But to hunt down consideration and reputation — to force the esteem of others — seemed to me an effort unworthy of myself, almost a degradation. A struggle with unfavorable opinion has seemed to me beneath me, for all the while my heart has been full of sadness and disappointment, and I have known and felt that I have been systematically and deliberately isolated. Untimely despair and the deepest discouragement have been my constant portion. Incapable of taking any interest in my talents for their own sake, I let everything slip as soon as the hope of being loved for them and by them had forsaken me. A hermit against my will, I have not even found peace in solitude, because my inmost conscience has not been any better satisfied than my heart.

Preface
The Great Rehearsal (1948)
Context: The most momentous chapter in American history is the story of the making and ratifying of the Constitution of the United States. The Constitution has so long been rooted so deeply in American life — or American life rooted so deeply in it — that the drama of its origins is often overlooked. Even historical novelists, who hunt everywhere for memorable events to celebrate, have hardly touched the event without which there would have been a United States very different from the one that now exists; or might have been no United States at all.
The prevailing conceptions of those origins have varied with the times. In the early days of the Republic it was held, by devout friends of the Constitution, that its makers had received it somewhat as Moses received the Tables of the Law on Sinai. During the years of conflict which led to the Civil War the Constitution was regarded, by one party or the other, as the rule of order or the misrule of tyranny. In still later generations the Federal Convention of 1787 has been accused of evolving a scheme for the support of special economic interests, or even a conspiracy for depriving the majority of the people of their liberties. Opinion has swung back and forth, while the Constitution itself has grown into a strong yet flexible organism, generally, if now and then slowly, responsive to the national circumstances and necessities.