“A vocation is not something you slap on, like a coat of paint, and change whenever you want. A vocation is built into you. You have no choice. If you try to do something else, you fail.”
Source: The Demon King
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Cinda Williams Chima 68
Novelist 1952Related quotes

Campaign speech in Michigan (1968) https://books.google.com/?id=uXRx5hGm8zYC&dq="Do+you+want+to+make+a+point+or+do+you+want+to+make+a+change"&pg=PA17
1960s

“If you want truly to understand something, try to change it.”
Attributed to Kurt Lewin in: Charles W. Tolman (1996) Problems of Theoretical Psychology - ISTP 1995. p. 31.

“If you want to make enemies, try to change something.”
Address to World's Salesmanship Congress http://books.google.com/books?id=w0IOAAAAIAAJ&pg=PA286&dq=%22want+to+make+enemies,+try+to+change+something%22, Detroit (10 July 1916)
1910s

Quote is actually from Tom Peters: The Best Corporate Strategy? None, Of Course. Chicago Tribune July 11, 1994 http://articles.chicagotribune.com/1994-07-11/business/9407110026_1_silicon-graphics-customers-richard-branson
Misattributed
Tom Peters in: " The Best Corporate Strategy? None, Of Course http://articles.chicagotribune.com/1994-07-11/business/9407110026_1_silicon-graphics-customers-richard-branson." Chicago Tribune, July 11, 1994.

Interview with Inc. Magazine for its "The Entrepreneur of the Decade Award" (1 April 1989) http://www.inc.com/magazine/19890401/5602.html
1980s
Variant: You can't just ask customers what they want and then try to give that to them. By the time you get it built, they'll want something new.
Source: The Celestine Prophecy: A Pocket Guide to the Nine Insights