Quotes about quotation
page 2

June 5, 1936 Fire
Diary entries (1914 - 1974)

“He ranged his tropes, and preached up patience;
Backed his opinion with quotations.”
Paulo Purganti and His Wife (1708).
Speech at Moorpark College, Moorpark, California (December 3, 1968).
Other
“I respect a man who can recognize a quotation. It's a dying art.”
Part IV, ch. 1, p. 245.
Small World (1984)
n.p.
Tim Marlow joins Anselm Kiefer to discuss his work' - 2005

“Letter to his wife (2 June 1863), as quoted in "The Oxford Dictionary of American Quotations" (2005) edited by Hugh Rawson and Margaret Miner.”
Vox populi, vox humbug.
1860s, 1863, Letter (June 1863)

“Classical quotation is the parole of literary men all over the world.”
May 8, 1781
Life of Samuel Johnson (1791), Vol IV

http://www.samharris.org/site/full_text/honesty-the-muslim-worlds-scarcest-resource 2012-03-01 Honesty: The Muslim World’s Scarcest Resource? - SamHarris.com, accessed March 1, 2012
2010s

volume III, chapter VI: "Miscellanea", page 252 http://darwin-online.org.uk/content/frameset?pageseq=264&itemID=F1452.3&viewtype=image; letter to William Ogle (22 February 1882)
Ogle had translated Aristotle's Parts of Animals and sent Darwin a copy.
The Life and Letters of Charles Darwin (1887)
The Story of Islamic Imperialism in India (1994)

“Every quotation contributes something to the stability or enlargement of the language.”
Preface http://andromeda.rutgers.edu/~jlynch/Texts/preface.html
A Dictionary of the English Language (1755)

with 'I think' obligatory
Brewer's Quotations (London: Cassell, 1994), p. x.
Adaptation of the original: "The Vagueness Is All" http://www.qunl.com/rees0001.html from Volume 2, Number 2, April 1993 issue of The “Quote... Unquote” Newsletter
Philip Larkin "Horn of Plenty", in Further Requirements ([2001] 2002) p. 320.
Criticism
Robert Edouard Moritz. On Mathematics and Mathematicians https://archive.org/details/onmathematicsmat00mori, 1914, 1942, 1958; p. v; Preface, lead sentence
“Texts from Housman”, p. 27
Kipling, Auden & Co: Essays and Reviews 1935-1964 (1980)

Cohen, Noam. (April 18, 2014). "Adrianne Wadewitz, 37, Wikipedia Editor, Dies After Rock Climbing Fall" http://www.nytimes.com/2014/04/19/business/media/adrianne-wadewitz-37-wikipedia-editor-dies-after-rock-climbing-fall.html. The New York Times.
About
I am an anarchist!
Prologue
Anarchism : A History of Libertarian Ideas and Movements (1962)

“In the dying world I come from, quotation is a national vice.”
Source: The Loved One (1948), Chapter 9
Context: In the dying world I come from, quotation is a national vice. No one would think of making an after-dinner speech without the help of poetry. It used to be the classics, now it's lyric verse.

“The most familiar quotations are the most likely to be misquoted.”
As quoted in The Oxford Dictionary of Quotations (1941) by Alice Mary Smyth, p. vii
Context: The most familiar quotations are the most likely to be misquoted. Some misquotations are still variable, some have settled down to false versions that have obscured the true ones. They have passed over from literature into speech.
Anarchism : A History of Libertarian Ideas and Movements (1962)
Context: Like such titles as Christian and Quaker, "anarchist" was in the end proudly adopted by one of those against whom it had been used in condemnation. In 1840, Pierre-Joseph Proudhon, that stormy, argumentative individualist who prided himself on being a man of paradox and a provoker of contradiction, published the work that established him as a pioneer libertarian thinker. It was What Is Property?, in which he gave his own question the celebrated answer: "Property is theft." In the same book he became the first man willingly to claim the title of anarchist.
Undoubtedly Proudhon did this partly in defiance, and partly in order to exploit the word's paradoxical qualities. He had recognized the ambiguity of the Greek anarchos, and had gone back to it for that very reason — to emphasize that the criticism of authority on which he was about to embark need not necessarily imply an advocacy of disorder. The passages in which he introduces "anarchist" and "anarchy" are historically important enough to merit quotation, since they not merely show these words being used for the first time in a socially positive sense, but also contain in germ the justification by natural law which anarchists have in general applied to their arguments for a non-authoritarian society.

Marlene Dietrich's ABC https://books.google.com/books?id=u7x5UYHMs0IC&pg=PT157 (1962)

The Finest Story in the World http://www.telelib.com/authors/K/KiplingRudyard/prose/ManyInventions/fineststory.html (1893).
Other works

Source: What is Anthropology? (2nd ed., 2017), Ch. 2 : Key Concepts

And this is much more broadly based. In fact, I think mercenary motives are among the least unattractive that we have.
Source: The Draft: A Handbook of Facts and Alternatives, Sol Tax, edit., chapter: “Recruitment of Military Manpower Solely by Voluntary Means,” chairman: Aristide Zolberg, University of Chicago Press (1967) p. 366, based on the Conference Held at the University of Chicago, December 4-7, 1966, also in Two Lucky People, Milton and Rose Friedman, Chicago: University of Chicago Press, 1998, p. 380.