“The first rule of holes: When you're in one stop digging.”
“We do have a saying in America: if you're in a hole, stop digging ….. erm, I'm not sure I should have said that.”
http://www.guardian.co.uk/quiz/questions/0,,1943315,00.html
http://www.cnn.com/2002/WORLD/europe/09/24/schroeder.blair/index.html
http://web.archive.org/web/20030621143902/http://www.abc.net.au/rn/talks/bbing/stories/s865620.htm
2000s
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Donald Rumsfeld 38
U.S. Secretary of Defense 1932Related quotes

“If you find yourself in a hole, the first thing to do is stop digging.”

“The most important thing to do if you find yourself in a hole is to stop digging.”

The Podfather Trilogy , Episode 2 Thanksgiving
On Calendars

"Trump called Bush a liar & he won South Carolina (Nevada, too)," http://www.unz.com/imercer/trump-called-bush-a-liar-he-won-south-carolina-nevada-too/ The Unz Review, February 27, 2016.
2010s, 2016

“You cannot dig a hole in a different place by digging the same hole deeper.”
Source: Lateral Thinking : Creativity Step by Step (1970), p. 8.

Imbalances of Power http://www.nytimes.com/2008/05/21/opinion/21friedman.html, May 21, 2008.

As quoted in "Constance Wu on Confronting Hollywood's Racism" in The Cut (18 July 2016) https://www.thecut.com/2016/07/constance-wu-on-racism-hollywood-fresh-off-the-boat.html