Quotes about originality
page 2

Royal Institution Lecture (April 30, 1897) as quoted by Edmund Taylor Whittaker, A History of the Theories of Aether and Electricity from the Age of Descartes to the Close of the Nineteenth Century http://books.google.com/books?id=CGJDAAAAIAAJ (1910).
Quotes eat me

Jeff Fager, Chairman of CBS News and Executive Producer of 60 Minutes — quoted in CNN, Longtime CBS newsman Andy Rooney hospitalized, CNN Wire Staff, October 26, 2011, Turner Broadcasting System, Inc. http://www.cnn.com/2011/10/25/showbiz/andy-rooney-hospitalized/index.html,
About

Microcosmos: Four Billion Years of Evolution from Our Microbial Ancestors (1986)

Quote in Mondrian's letter to Rudolf Steiner, c. 1921-23; as cited in Abstract Painting, Michel Seuphor, Dell Publishing Co 1964, p. 83-85
1920's

The Perfect Way in Diet (London: Kegan Paul, Trench & Co., 1881), pp. 13 https://archive.org/stream/perfectwayindie00kinggoog#page/n34-14.

Sec. 13
The Gay Science (1882)

Nam June Paik, “Cybernated Art,” in Manifestos, Great Bear Pamphlets, (New York: Something Else Press, 1966), p. 24; Quoted in: Edward A. Shanken, " Cybernetics and Art: Cultural Convergence in the 1960s http://www.artexetra.com//CyberneticsArtCultConv.pdf," in: From Energy to Information: Representation in Science, Technology, Art, and Literature, Stanford University Press, Bruce Clarke and Linda Dalrymple Henderson (eds.), 2002.
1960s

Regarding Forrest's millitary genius, William T. Sherman w:The Life of General Nathan Bedford Forrest, by John Allan Wyeth, p.635.

Der thörigste von allen Irrthümern ist, wenn junge gute Köpfe glauben, ihre Originalität zu verlieren, indem sie das Wahre anerkennen, was von andern schon anerkannt worden.
Maxim 254, trans. Stopp
Maxims and Reflections (1833)

A picture of a dinosaur on the back of the tag, you know?
I'm Not Fat, I'm Fluffy (2009)
“Originality is the fine art of remembering what you hear but forgetting where you heard it.”
Source: Peter's Quotations: Ideas for Our Time (1977), p. 362

Source: Reflections and Maxims (1746), p. 185.
Moving Forward
Poetry

On Truth and Lie in an Extra-Moral Sense (1873)

Of the Origin and Progress of Language (Edinburgh and London: J. Balfour and T. Cadell, 2nd ed., 1774), Vol. I, Book II, Ch. II, pp. 224-225 https://archive.org/stream/originandprogre01conggoog#page/n251/mode/2up.

Letter to Giovanni Battista Baliani (1639)

Source: 1910s, Proposed Roads To Freedom (1918), Ch. VI: International relations, p. 97

1910s, Address to the Knights of Columbus (1915)

allegedly said in 1907 according to 13 March 2013 article http://princearthurherald.com/en/politics-2/another-gaffe-by-trudeau-551 by Michael Eugenio of the Herald. The quote was also used 8 December 2015 by David Kendrick in Guelph Mercury https://www.guelphmercury.com/opinion-story/6163164-canada-is-losing-some-of-its-identity/
3 March 2017 report by Melissa Martin of Winnipeg Free Press https://www.winnipegfreepress.com/special/goodnews/moment-of-clarity-in-my-canada-415358084.html described as having been wrongly attributed for at least 7 years, based on a Teddy Roosevelt quote
Misattributed

One of two draft letters (25 July, 1938) written for Stanley Unwin to select as a response to his German publishers inquiry about his ancestry. The other letter refused to answer altogether on his ancestry; since the quoted letter persists, it seems that the other letter was sent.
The Letters of J. R. R. Tolkien (1981)

Quoted in Reich, Willi (1971). Schoenberg: A Critical Biography, p. 34. Translated by Leo Black.

Vol. I, Part III: The Evolution of Life, Ch. 3 : General Aspects of the Evolution Hypothesis; compare: "As nine months go to the shaping an infant ripe for his birth, / So many a million of ages have gone to the making of man", Alfred Lord Tennyson, Maud (1855)
Principles of Biology (1864)

1937 and 1945)
Douglass North, in "Structure and Change in Economic History" (1981), p. 36

as stated in "The Edinburgh Review" on page 521 by Sydney Smith, Francis Jeffrey Jeffrey, William Empson, Macvey Napier, George Cornewall Lewis, Henry Reeve, Arthur Ralph Douglas Elliot, and Harold Cox, publication in 1860.
Quotee

However, that wouldn't work in Poland or New York City, where the Jews are of an inferior strain, & so numerous that they would essentially modify the physical type.
Letter to Natalie H. Wooley (22 November 1934), in Selected Letters V, 1934-1937 edited by August Derleth and Donald Wandrei, p. 77
Non-Fiction, Letters

“Although only a few may originate a policy, we are all able to judge it.”
As quoted in The Open Society and Its Enemies by Karl Popper (1966). Book II, chapter 40.

Napoleon : In His Own Words (1916)

"The Late Benjamin Franklin", The Galaxy, Vol. 10, No. 1, July 1870 http://books.google.com/books?id=2TIZAAAAYAAJ&pg=PA139. Anthologized in Mark Twain's Sketches, New and Old http://books.google.com/books?id=5LcIAAAAQAAJ (1875)

“Love's great (and sole) originality is to make happiness indistinct from misery.”
Anathemas and Admirations (1987)

Whig Circular (1843), reported in Richard Watson Gilder and Daniel Fish Complete Works of Abraham Lincoln, Volume 1 (1905)
1840s

Leo Strauss, Farabi's Plato http://contemporarythinkers.org/leo-strauss/essay/farabis-plato/, Louis Ginzberg Jubilee Volume, American Academy for Jewish Research, 1945. Reprinted, revised and abbreviated, in Persecution and the Art of Writing.

p 45
The Undiscovered Self (1958)

The Triple Thinkers (1938) [Oxford University Press, 1948], Preface, p. ix

Source: Fascism: What It Is and How to Fight It (1944), Ch. 4

that is all he did. These object lessons should teach us that ninety-nine parts of all things that proceed from the intellect are plagiarisms, pure and simple; and the lesson ought to make us modest. But nothing can do that.
Letter to Helen Keller, after she had been accused of plagiarism for one of her early stories (17 March 1903), published in Mark Twain's Letters, Vol. 1 (1917) edited by Albert Bigelow Paine, p. 731

The Psychology of the Unconscious (1943)

“The circulation of commodities is the original precondition of the circulation of money.”
Grundrisse (1857-1858)
Source: Notebook I, The Chapter on Money, p. 107.

Prologue
Beyond Belief: Islamic Excursions Among the Converted Peoples (1998)

Source: 1910s, Mysticism and Logic and Other Essays http://archive.org/stream/mysticism00russuoft/mysticism00russuoft_djvu.txt (1918), Ch. 6: On the Scientific Method in Philosophy

Variant translation: I hold that the Sun is located at the centre of the revolutions of the heavenly orbs and does not change place, and that the Earth rotates on itself and moves around it. Moreover … I confirm this view not only by refuting Ptolemy's and Aristotle's arguments, but also by producing many for the other side, especially some pertaining to physical effects whose causes perhaps cannot be determined in any other way, and other astronomical discoveries; these discoveries clearly confute the Ptolemaic system, and they agree admirably with this other position and confirm it.
Letter to the Grand Duchess Christina (1615)

Expositions and Developments (1959), pp. 113-114
1950s
Buddhism vis-a-vis Hinduism (1958, revised 1984)

1860s, Fourth of July Address to Congress (1861)

p, 125
"Ethan Brand" (1850)

Ohlin (1924), quoted (and translated) in: Eli Filip Heckscher, Bertil Gotthard Ohlin, Henry Flam Heckscher-Ohlin trade theory, (1991), p. 76.
1920s

Rečnik od tri jezika: s. makedonski, arbanski i turski [Dictionary of Three languages: Macedonian, Albanian, Turkish], U držacnoj štampariji, 1875, p. 48f.

Letter to Pavel Vasilyevich Annenkov, (28 December 1846), Rue d'Orleans, 42, Faubourg Namur, Marx Engels Collected Works Vol. 38, p. 95; International Publishers (1975). First Published: in full in the French original in M.M. Stasyulevich i yego sovremenniki v ikh perepiske, Vol. III, 1912
Richard Carrier, "Bad Science, Worse Philosophy", Addendum B, http://www.infidels.org/library/modern/richard_carrier/addendaB.html#et_al at The Secular Web (Internet Infidels: 2000)
About

Opening lines.
1770s, Common Sense (1776)
Source: Management Science (1968), Chapter 7, Automation and Such, p. 177.

Dr. Martin Luther King Jr. National Memorial Groundbreaking Ceremony (13 November 2006)
2006

Wir müssen alle einmal erlöst werden. Die Welt zieht uns mit tausend Banden. Wir fehlen aus Gleichgültigkeit und Nachsicht und häufen neue eigene Schuld auf alte ererbte. Unser Leben ist eine Kette aus Schuld und Sühne, darüber ein nach unerforschlichen Gesetzen wirkendes Schicksal waltet.
Michael: a German fate in diary notes (1926)

“All seed except Mary was vitiated [by original sin].”
by original sin Weimar edition of Martin Luther's Works, English translation edited by J. Pelikan [Concordia: St. Louis], Vol. 11, WA, 39, II:107

Dissenting in Harper v. Virginia Board of Elections, 383 U.S. 663 (1966).

"Experiments With Alternating Currents of Very High Frequency, and Their Application to Methods of Artificial Illumination" (20 May 1891)

“I am equally proud of my Serbian origin and Croatian homeland.”
In response telegram to the President of HSS (Croatian Peasant Party), Vladko Maček http://predsjednik.hr/Default.aspx?art=12900&sec=810 (June 1936)

2015, Commemoration of the 150th Anniversary of the 13th Amendment (December 2015)

Letter to Elizabeth Toldridge (8 March 1929), in Selected Letters II, 1925-1929 edited by August Derleth and Donald Wandrei, p. 316
Non-Fiction, Letters

Letter to Judge J. A. Wakefield, after the death of Lincoln's son Willie in 1862, as cited in Abraham Lincoln: was he a Christian? (1893), p. 292 http://books.google.com/books?id=x8BHAAAAIAAJ&pg=PA292&dq=%22unsoundness+of+the+Christian+scheme%22, by John Eleazer Remsburg. Historian Merrill Daniel Peterson states in Lincoln in American Memory (1994), p. 227 http://books.google.com/books?id=D_FjY_ARcGoC&lpg=PA227&vq=%22Judge%20J.%20A.%20Wakefield%22&pg=PA227, that the letter has never actually been produced to verify the statement and that there's no correspondence with Wakefield noted in the Collected Works.
Misattributed

Canon Mirificus, Englsh edition (1616)
Memoirs of John Napier of Merchiston (1834)

Letter to Elizabeth Toldridge (8 March 1929), in Selected Letters II, 1925-1929 edited by August Derleth and Donald Wandrei, pp. 316-317
Non-Fiction, Letters

Other

<span class="plainlinks"> Foreword, 'Tales of Transformation: English Translation of Tagore's Chitrangada and Chandalika', Lopamudra Banerjee, (2018). https://www.amazon.co.uk/dp/B07DQPD8F4/</span>
From Prose

“To create man was a fine and original idea; but to add the sheep was a tautology.”
St. Louis Post-Dispatch (30 May 1902); also in Mark Twain : A Life, p. 611

On executing minors: Roper v. Simmons (2005) (dissenting).
2000s
GM I 2 p. 26
Source: Nietzsche and Philosophy (1962), p. 2

Vol. I, Ch. 15 (last sentence), pg. 556.
(Buch I) (1867)

These remarks in support of a government-regulated money supply were written by Gerry McGeer, who presented them as his interpretation of what Lincoln believed. [McGeer, Gerald Grattan, w:Gerald Grattan McGeer, The Conquest of Poverty, 5 - Lincoln, Practical Economist, http://heritech.com/pridger/lincoln/mcgeer/mcgeerv.htm, 2009-07-29, 1935, Garden City Press, Gardenvale, Quebec, 186ff]
Misattributed

1860s, Speech in Independence Hall (1861)

“Whether he be an original or a plagiarist, man is the novelist of himself.”
“Man has no nature”
History as a System (1962)

http://www.bartleby.com/43/24.html
1790s, Farewell Address (1796)

Grade die Individualität ist das Ursprüngliche und Ewige im Menschen; an der Personalität ist so viel nicht gelegen. Die Bildung und Entwicklung dieser Individualität als höchsten Beruf zu treiben, wäre ein göttlicher Egoismus.
“Selected Ideas (1799-1800)”, Dialogue on Poetry and Literary Aphorisms, Ernst Behler and Roman Struc, trans. (Pennsylvania University Press:1968) # 60