“Why do you want to come into physics? All is done and understood.”
as an advice to Max Planck not to study physics, by Anton Z. Capri, Quips, Quotes and Quanta http://worldscibooks.com/physics/6546.html. World Scientific (2007). p. 1. ISBN 9812709207
a similar advice has been given by Philipp von Jolly, as related by Max Planck in his lecture Vom Relativen zum Absoluten (December 1, 1924).
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Gustav Kirchhoff 2
German physicist 1824–1887Related quotes

2007-11-12
Countdown with Keith Olbermann
MSNBC
Television
http://www.msnbc.msn.com/id/21771581/
explaining to his ombudsman, Laurie Dhue, what to do about mail complaining about the low quality of Fox News Channel material; November 2007

Source: 1980s–1990s, Barbarians inside the Gates and Other Controversial Essays (1999)

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

"I'm Too Big But I Love To Play" in Ten Thousand Light-Years From Home (1973)
TED: "How to run a company with (almost) no rules" https://www.ted.com/talks/ricardo_semler_how_to_run_a_company_with_almost_no_rules/ (October 2014)

As quoted in The Federal Career Service: A Look Ahead (1954)
1950s
Variant: Now I think, speaking roughly, by leadership we mean the art of getting someone else to do something that you want done because he wants to do it.