Quotes about warning
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“WARNING
If you dare to read this story, you become part of the Experiment”

"Sisterhood" in New York Magazine (20 December 1971), p. 49

“Warning: If you are insufferable, do not walk here. We shall eat you down to the marrow.”
Source: A Great and Terrible Beauty
Source: Lawe's Justice
Source: The Ape Who Guards the Balance
Source: The Boyfriend List: 15 Guys, 11 Shrink Appointments, 4 Ceramic Frogs and Me, Ruby Oliver

“We are the people our parents warned us about.”

Source: The Varieties of Scientific Experience: A Personal View of the Search for God

“Next time you wish to feed me poison, warn me first," Loor demanded. (The Merchant of Death)”
“If I can't serve as a role model, let me serve as a warning.”

Source: The Funny Thing Is...

“we are the women our parents warned us against, and we are proud”

“As the Nobel laureate Elie Wiesel warned years ago, to forget a holocaust is to kill twice.”
Source: The Rape of Nanking

1910s, Speech in the Reichstag, 18 March 1918

Five Holy Virgins, Five Sacred MythsOf Kunti and Satyawati Sexually Assertive Women of the Mahabharata

Unidentified press conference, 1968
Featured in Pat Paulsen for President (1968), part 2 of 6 http://www.youtube.com/watch?v=KbP0ufyax5A&feature=relmfu, 01:01 ff (10:01 ff in full program)
"Bring Back the Party of Lincoln" http://www.nytimes.com/2014/09/04/opinion/bring-back-the-party-of-lincoln.html?_r=0 (3 September 2014), The New York Times, New York

Letter to The Times after Thatcher claimed that British people were afraid of being "swamped" by people of a different culture. (11 February 1978), p. 15
1960s–1970s
Quantum Profiles (1991), John Stewart Bell: Quantum Engineer

“Soldiers for equality, uh? Glad you warned me. I’d have thought you were just thieves.”
Part 4 “Hiruko: Six Years Later”, Chapter 1 (p. 148)
Against Infinity (1983)

Tusnádfürdő speech http://www.kormany.hu/en/the-prime-minister/the-prime-minister-s-speeches/viktor-orban-s-presentation-at-the-27h-balvanyos-summer-open-university-and-student-camp, 26 July 2016
Jesus, Jews and the Shoah: A Moral Reckoning by Daniel Jonah Goldhagen (2003)

Speech in the House of Lords (23 November 1819). The Speech from the Throne at the opening of the session of 1819-20 called for strong measures against the seditious spirit shown in the manufacturing districts. Grey moved an amendment in the Lords, calling for an enquiry into the Peterloo Massacre of 16 August, in order to maintain ‘that confidence in the public institutions of the country, which constitutes the best safeguard of all law and government.’ His amendment was defeated by 159 votes to 34. Parliamentary Debates, vol. xli, pp. 7-19, quoted in Alan Bullock and Maurice Shock (ed.), The Liberal Tradition from Fox to Keynes (Oxford: Clarendon Press, 1967), pp. 5-6.
1810s

Opening address to the Great Council of Chiefs meeting, 27 July 2005 (excerpts)

"Pagavan E : Zabel Yesayan'ın Barış Çağrısını Duyabilmek"] ["Enough! : Being Able to Hear Zabel Yesayan's Call for Peace"] by Melissa Bilal, in Kültür ve Siyasette Feminist Yaklaşımlar [Feminist Approaches in Culture and Politics], Issue 7 (March 2009)

Japan, the Beautiful and Myself (1969)
“My one purpose in life is to serve as a warning to others.”
DNA Lounge blog http://www.dnalounge.com/backstage/log/2004/04.html#18

Interview with George Gurley in The New York Observer (10 January 2005).
2005

The real function of these tests, I decide, is to convey information not to the employer but to the potential employee, and the information conveyed is always: You will have no secrets from us.
Source: Nickel and Dimed: On (Not) Getting by in America (2001), Ch. 2: Scrubbing in Maine (p. 59)

Source: The Man With the Iron Heart (2008), p. 413
Rudolf Carnap, as quoted in The Philosophy of Rudolf Carnap (1963) by Paul Arthur Schilpp, p. 25, and in Ludwig Wittgenstein : The Duty of Genius (1991) by Ray Monk, p. 244

1960s, I've Been to the Mountaintop (1968)

Sermon about Ireland, July 29, 2007. Letter from UK Border Agency: WBC has been banned from the UK http://www.godhatesfags.com/written/fliers/archive/20090224_uk-border-agency.pdf. GodHatesFags.com. February 19, 2009.
2000s, Ireland (2007)

Commentaries on the Prophet Zechariah. Part 9 http://www.iclnet.org/pub/resources/text/ipb-e/epl-09/cvzec-09.txt.
Zecharia
Quoted in In Hitler's Bunker: A Boy Soldier's Eyewitness Account of the Fuhrer's Last Days (2005) by Armin D. Lehmann and Tim Carroll, p. 91, and in The Rise of the Fourth Reich: The Secret Societies That Threaten to Take Over America (2009) by Jim Marrs, p. 342.

1860s, Our Composite Nationality (1869)

"Gabriel" in The Century : A Popular Quarterly, Volume 18 (1874), p. 617.

“Memo to himself: the one way to make people panic was to warn them not to.”
Source: Absolution Gap (2003), Chapter 4 (p. 56)
The Boyle lecture (2005)
“Man will take anything you like, except warning.”
"That a Burnt Child often Dreads the Fire".
Sketches from Life (1846)

United Nations General Assembly - Promotion of a democratic and equitable international order http://www.ohchr.org/Documents/Issues/IntOrder/A-68-284_en.pdf.
2013

The Defender's Guide for Life's Toughest Questions (2011)

Speech to Greater London Young Conservatives (Iain Macleod Memorial Lecture - "Dimensions of Conservatism") (4 July 1977) http://www.margaretthatcher.org/document/103411
Leader of the Opposition

“Why the United States Is Destroying Its Education System” (2011)

As stated in, Prosecutorial Discretion: Let's Haul That Kid In Front of the Judge to Scare Him- Not. http://www.newsreview.com/sacramento/is-former-sacramento-media-employee/content?oid=13239765
Variant: The days of ‘Let’s haul this kid in front of the judge, scare him and send him home with a warning’ are long since gone,” says attorney Jay Leiderman. “ Prosecutorial discretion is a great thing if it’s exercised, but it doesn’t happen in any meaningful way these days, because prosecutions are so politicized.