“There are only two options in life: Either you refrain yourself from making promises or from breaking them after you have failed the first test.”
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Mwanandeke Kindembo 1044
Congolese author 1996Related quotes

As quoted in "If Elected I Promise … " Stories and Gems of Wisdom by and About Politicians (1969) by John F. Parker

Time Management (2007)
Context: General Advice: Never break a promise, but re-negotiate them if need be. If you haven’t got time to do it right, you don’t have time to do it wrong. Recognize that most things are pass/fail. Feedback loops: ask in confidence.

Ghost Town, 2008 http://www.youtube.com/watch?v=_5SYnbz7wgU

Variations of this quote have been attributed to a number of people, including Eleanor Roosevelt, Samuel Levenson, and Lao Tzu; there is no solid support for any such attribution.
Misattributed

Victor commented darkly, “That explains why religions have rules no one can follow. If everyone is a sinner, by definition, everyone is under their power.”
Source: Fugitives of Chaos (2006), Chapter 9, “Wings” (p. 142)

Source: Think Big (1996), p. 50