“Life is a trick, and you get one chance to learn it.”
Source: Nation
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Terry Pratchett 796
English author 1948–2015Related quotes

“One of the things I've learned in my life is that sometimes you've got to take a chance.”
Source: Message in a Bottle

“Horses can manufacture more horses and that is one trick that tractors have never learned.”
Source: Farmer in the Sky (1950), Chapter 18, “Pioneer Party” (p. 187)

“Life is not fair. Get used to it… Be nice to nerds. Chances are you'll end up working for one.”
Though widely attributed to Gates on the internet, this list of life suggestions is actually based on one from Charles J. Sykes. More information at Snopes.com http://www.snopes.com/language/document/liferule.htm
Misattributed