“Do we realize that industry, which has been our good servant, might make a poor master?”
"A Plea for Wilderness Hunting Grounds" [1925]; Published in Aldo Leopold's Southwest, David E. Brown and Neil B. Carmony (eds.) 1990 , p. 160.
1920s
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Aldo Leopold 130
American writer and scientist 1887–1948Related quotes

“The markets make a good servant but a bad master, and a worse religion”
[This much I know: Amory Lovins, http://www.guardian.co.uk/environment/2008/mar/23/ethicalliving.lifeandhealth4, The Guardian, 2008-11-20]

“The free individual has been justified as his own master; the state as his servant.”
Commencement Address at Columbia University http://www.eisenhower.archives.gov/education/bsa/citizenship_merit_badge/eisenhower_citizenship_quotations.pdf (1 June 1949)
1940s

“Words are good servants but bad masters.”
As quoted by Laura Huxley, in conversation with Alan Watts about her memoir This Timeless Moment (1968), in Pacifica Archives #BB2037 [sometime between 1968-1973])

“Money. It's a good servant but a bad master.”
Source: The Happiness Project: Or Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun

Colonel Andrew Jackson Hickock in Lone Star Planet (1958)

Source: 1900s, Up From Slavery (1901), Chapter XVI: Europe
Context: In one thing, at least, I feel sure that the English are ahead of Americans, and that is, they have learned how to get more out of life. The home life of the English seems to me to be about as perfect as anything can be. Everything moves like clockwork. I was impressed, too, with the deference that the servants show to their "masters" and "mistresses" - terms which I suppose would not be tolerated in America. The English servant expects, as a rule, to be nothing but a servant, and so he perfects himself in the art to a degree that no class of servants in America has yet reached. In our country the servant expects to become, in a few years, a "master" himself. Which system is preferable? I will not venture an answer.

“The more servants a master has, the more enemies he has.”
Act I, scene II. — (Polinico).
Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 432.
La Calandria (c. 1507)

“4702. The Passions are like Fire and Water; good Servants, but bad Masters.”
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)