“Some quotations," said Zellaby, "are greatly improved by lack of context.”

Holidays in Hell (1989)

Supposedly from De Oratore, 78 ("...for women more easily preserve the ancient language unaltered, because, not having experience of the conversation of a multitude of people, they always retain what they originally learned..."), reported in Bartlett's Familiar Quotations, 10th ed. (1919). Compare: "Loveliness / Needs not the foreign aid of ornament, / But is when unadorn'd, adorn'd the most", James Thomson, The Seasons, "Autumn", Line 204
Disputed

Essay as "Mr. X" (1969)
Context: The cannabis experience has greatly improved my appreciation for art, a subject which I had never much appreciated before. The understanding of the intent of the artist which I can achieve when high sometimes carries over to when I'm down. This is one of many human frontiers which cannabis has helped me traverse. There also have been some art-related insights — I don't know whether they are true or false, but they were fun to formulate.

http://www.washingtonpost.com/wp-dyn/content/article/2006/11/08/AR2006110801579.html?nav=rss_politics
During the Nomination of Robert Gates for the next U.S. Secretary of Defense, November 8, 2006
2000s

1870s, Society and Solitude (1870), Quotation and Originality
Source: Prose and Poetry

"Why Wikipedia Must Jettison Its Anti-Elitism" at kuro5hin (31 December 2004).

Prostitution, Trafficking, and Cultural Amnesia (2006)
Context: U. S. prostitution can be understood in the context of the cultural normalization of prostitution as a glamorous and wealth-producing “job” for girls who lack emotional support, education, and employment opportunities. The sexual exploitation of children and women in prostitution is often indistinguishable from incest, intimate partner violence, and rape.

Speech opening Parliament, 1 August 2005 (excerpts)

Quine's paradox, in "The Ways of Paradox" in "The Ways of Paradox and other Essays" (1976)
1970s