“The three rules of the Librarians of Time and Space are: 1) Silence; 2) Books must be returned no later than the last date shown; and 3) Do not interfere with the nature of causality.”

Source: Guards! Guards!

Last update Sept. 29, 2023. History

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Terry Pratchett 796
English author 1948–2015

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“Rule 1, on page 1 of the book of war, is: "Do not march on Moscow". Various people have tried it, Napoleon and Hitler, and it is no good. That is the first rule. I do not know whether your Lordships will know Rule 2 of war. It is: "Do not go fighting with your land armies in China."”

Bernard Montgomery, 1st Viscount Montgomery of Alamein (1887–1976) British Army officer, Commander of Allied forces at the Battle of El Alamein

It is a vast country, with no clearly defined objectives.
In the House of Lords, 30 May 1962 ( Hansard, Col. 227 http://hansard.millbanksystems.com/lords/1962/may/30/the-army-estimates#S5LV0241P0-00791)

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“Rule No. 1: Never lose money. Rule No. 2: Never forget rule No. 1.”

Warren Buffett (1930) American business magnate, investor, and philanthropist

This maxim (perhaps of gambling or horse racing origin) is widely attributed to Warren Buffett and, as such, has traditionally been cited in print; notably, it was attributed (perhaps facetiously) to him by Mary Buffett in, The Tao of Warren Buffett. A more uncommon, less well known version, and perhaps one with a more lasting credibility (or certainly with a higher degree of checkability), would be: "The first rule is don't lose, and the second rule is never forget the first rule." This version was noted by Steve Forbes in a friendly meeting in Omaha, in an article published as: Jay-Z, Buffett and Forbes on Success and Giving Back. This article is available on the Forbes website, published on September 23, 2010.
Disputed
Variant: Rule No. 1: Never lose money. Rule No. 2: Never forget rule No. 1.

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