“Conservation is a state of harmony between men and land. … Harmony with land is like harmony with a friend; you cannot cherish his right hand and chop off his left. That is to say, you cannot love game and hate predators; you cannot conserve the waters and waste the ranges; you cannot build the forest and mine the farm. The land is one organism.”

Source: A Sand County Almanac, 1949, "The Land Ethic", p. 207.

1960s, Why We Can't Wait (1964)
Context: Someone once wrote: "When you are right, you cannot be too radical; when you are wrong, you cannot be too conservative." The Negro knows he is right.

Address to the court in People v. Lloyd (1920)

Source: The Gunslinger

You will be right.
Speech to the Young : Speech to the Progress-Toward

Source: The Adventures of Sherlock Holmes

"Conservation" (c. 1938); Published in Round River, Luna B. Leopold (ed.), Oxford University Press, 1966, p. 155.
1930s
Source: Round River: From the Journals of Aldo Leopold

This Land Is Your Land (1940; 1944)

"Conservation" (c. 1938); Published in Round River, Luna B. Leopold (ed.), Oxford University Press, 1966, p. 157.
1930s