“Organisms […] are directed and limited by their past. They must remain imperfect in their form and function, and to that extent unpredictable since they are not optimal machines. We cannot know their future with certainty, if only because a myriad of quirky functional shifts lie within the capacity of any feature, however well adapted to a present role.”
"Quick Lives and Quirky Changes", p. 65
Hen's Teeth and Horse's Toes (1983)
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Stephen Jay Gould 274
American evolutionary biologist 1941–2002Related quotes

Source: Zero Gravity interview (2006), p. 75
Margaret Wheatley (1992), as quoted in 100 Ways to Motivate Yourself (2004) by Steve Chandler, p. 123
"Only His Wings Remained", p. 54
The Flamingo's Smile (1985)

Small Houses: Their Economic Design and Construction (1922)
Context: In the human form, as nature tries to make it, every feature is useful and every feature is beautiful. Each member is perfectly adapted to the function it has to perform; nothing is superfluous, yet the whole and every part is supremely decorative.<!-- Introduction
Source: The Functions of the Executive (1938), p. vii

Theoria motus corporum coelestium in sectionibus conicis solem ambientum (1809) Tr. Charles Henry Davis as Theory of the Motion of the Heavenly Bodies moving about the Sun in Conic Sections http://books.google.com/books?id=cspWAAAAMAAJ& (1857)
"Brotherhood by Inversion", p. 328
Leonardo's Mountain of Clams and the Diet of Worms (1998)

On Protracted Warfare (1938)
Original: (zh-CN) 指导战争的人们不能超越客观条件许可的限度期求战争的胜利,然而可以而且必须在客观条件的限度之内,能动地争取战争的胜利。战争指挥员活动的舞台,必须建筑在客观条件的许可之上,然而他们凭借这个舞台,却可以导演出很多有声有色、威武雄壮的戏剧来。
Source: Onward Industry!, 1931, p. 50-59, as cited in Lyndall Urwick (1937;50)