“A thing is right when it tends to preserve the integrity, stability and beauty of the biotic community. It is wrong when it tends otherwise.”
Source: A Sand County Almanac, 1949, "The Land Ethic", p. 224-225.
Source: A Sand County Almanac and Sketches Here and There
Context: Examine each question in terms of what is ethically and esthetically right, as well as what is economically expedient. A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community. It is wrong when it tends otherwise.
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Aldo Leopold 130
American writer and scientist 1887–1948Related quotes

Caen, Herb. Herb Caen's San Francisco, 1976-1991, page 159. Chronicle Books, 1992. ISBN
Attributed
The Liberals' Mistake (1987)
Context: The country we live in is a laboratory. We have one experiment after another. Unfortunately, it is not a laboratory where no one gets hurt: some lives are enhanced, others are ruined. We have to view our society with concern and passion, and see what we can learn from each of our experiments. When we get upset and angry about politics — whether it is conservative, liberal, or whatever — we tend to think in terms of right and wrong, not what we can learn.
Leon Festinger and John Thibaut. "Interpersonal communication in small groups." The Journal of Abnormal and Social Psychology 46.1 (1951): 92.
Leon Festinger and John Thibaut. "Interpersonal communication in small groups." The Journal of Abnormal and Social Psychology 46.1 (1951): 92.

short quotes, May 1972; p. 87
1970's, Conversations with Samuel Beckett and Bram van Velde (1970 - 1972)

“With all things being equal, the simplest explanation tends to be the right one.”
Variant: The simplest explanation is usually the right one

“Integrity is doing the right thing, even when no one is watching.”
Not found in Lewis's works.
"Integrity means doing the right thing at all times, without hesitation" is found in a 1943 syndicated newspaper column. Elsie Robinson, "Listen, World!" https://www.newspapers.com/newspage/58360960/, Evening News (Harrisburg, PA), 1943-02-24, p. 10.
"Integrity means doing the right thing even when no one is there to judge" is found (unattributed) in the 1965 Journal of Clinical Psychology https://books.google.com/books?id=9rm1AAAAIAAJ&dq=%22integrity%22+%22doing+the+right+thing%22&focus=searchwithinvolume&q=%22doing+the+right+thing%22.
The quote became attributed to C.S. Lewis by 2012 https://books.google.com/books?id=XH-1TURLaf4C&pg=PT154&dq=integrity+%22even+when%22+%22c+s+lewis%22&hl=en&sa=X&ved=0ahUKEwi6x9XznoTKAhUKymMKHdoKCKoQ6AEIHTAA#v=onepage&q=integrity%20%22even%20when%22%20%22c%20s%20lewis%22&f=false.
Misattributed