Aldo Leopold Zitate

"A Man's Leisure Time," 1920; Published in Round River, Luna B. Leopold (ed.), Oxford University Press, 1966, p. 8.
1920s
Quelle: A Sand County Almanac and Sketches Here and There

“Wisconsin: Flambeau”, p. 113.
A Sand County Almanac, 1949, "Wisconsin: Marshland Elegy," "Wisconsin: The Sand Counties" "Wisconsin: On a Monument to the Pigeon," and "Wisconsin: Flambeau"

Quelle: A Sand County Almanac, 1949, "Conservation Esthetic", p. 176.
Quelle: A Sand County Almanac and Sketches Here and There
Kontext: The trophy-recreationist has peculiarities that contribute in subtle ways to his own undoing. To enjoy he must possess, invade, appropriate. Hence the wilderness that he cannot personally see has no value to him. Hence the universal assumption that an unused hinterland is rendering no service to society. To those devoid of imagination a blank place on the map is a useless waste; to others, the most valuable part.

“Wisconsin: Marshland Elegy”, p. 101.
A Sand County Almanac, 1949, "Wisconsin: Marshland Elegy," "Wisconsin: The Sand Counties" "Wisconsin: On a Monument to the Pigeon," and "Wisconsin: Flambeau"
Quelle: A Sand County Almanac and Sketches Here and There
Kontext: To build a road is so much simpler than to think of what the country really needs. A roadless marsh is seemingly as worthless to the alphabetical conservationist as an undrained one was to the empire-builders. Solitude, the one natural resource still undowered of alphabets, is so far recognized as valuable only by ornithologists and cranes.
Thus always does history, whether of marsh or market place, end in paradox. The ultimate value in these marshes is wildness, and the crane is wildness incarnate. But all conservation of wildness is self-defeating, for to cherish we must see and fondle, and when enough have seen and fondled, there is no wilderness left to cherish.

Quelle: A Sand County Almanac and Sketches Here and There

Quelle: A Sand County Almanac, 1949, "The Land Ethic", p. 224-225.
Quelle: A Sand County Almanac and Sketches Here and There
Kontext: 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.

“November: Axe-in-Hand”, p. 71.
Quelle: A Sand County Almanac, 1949, "November: Axe-in-Hand," "November: A Mighty Fortress," and "December: Pines above the Snow"

“Arizona and New Mexico: Thinking Like a Mountain”, p. 133.
This is a paraphrase of Thoreau: see explanation by the Walden Woods project http://www.walden.org/Library/Quotations/The_Henry_D._Thoreau_Mis-Quotation_Page).
Quelle: A Sand County Almanac, 1949, "Arizona and New Mexico: On Top," & "Arizona and New Mexico: Thinking Like a Mountain"

Quelle: A Sand County Almanac, 1949, Manitoba: Clandeboye, p. 168.
Quelle: A Sand County Almanac and Sketches Here and There

“April: Sky Dance”, p. 32-33.
A Sand County Almanac, 1949, "April: Come High Water," "April: Draba," "April: Bur Oak," & "April:Sky Dance"
Quelle: A Sand County Almanac and Sketches Here and There

"Conservation" (c. 1938); Published in Round River, Luna B. Leopold (ed.), Oxford University Press, 1966, p. 145-146.
1930s
Kontext: 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.

Quelle: A Sand County Almanac, 1949, "Chihuahua and Sonora: The Green Lagoons", p. 149.

“Illinois and Iowa: Red Legs Kicking”, p. 120.
A Sand County Almanac, 1949, "Illinois and Iowa: Red Legs Kicking," "Arizona and New Mexico: Thinking Like a Mountain,"

“April: Draba”, p. 26.
A Sand County Almanac, 1949, "April: Come High Water," "April: Draba," "April: Bur Oak," & "April:Sky Dance"

“March: The Geese Return”, p. 20.
A Sand County Almanac, 1949, "January Thaw", "February: Good Oak" & "March: The Geese Return"

Quelle: A Sand County Almanac, 1949, "Chihuahua and Sonora: The Green Lagoons", p. 153-154.

“August: The Green Pasture”, p. 51.
A Sand County Almanac, 1949, "August: The Green Pasture," "September: The Choral Copse," "October: Smoky Gold," and "October: Red Lanterns"

Quelle: A Sand County Almanac, 1949, "Conservation Esthetic", p. 165.

Quelle: A Sand County Almanac, 1949, "Wilderness", p. 188.

“Arizona and New Mexico: On Top”, p. 126.
A Sand County Almanac, 1949, "Arizona and New Mexico: On Top," & "Arizona and New Mexico: Thinking Like a Mountain"

Quelle: A Sand County Almanac, 1949, "Chihuahua and Sonora: The Green Lagoons", p. 157-158.

"Conservation" (c. 1938); Published in Round River, Luna B. Leopold (ed.), Oxford University Press, 1966, p. 145-146.
1930s

“February: Good Oak”, p. 6.
Quelle: A Sand County Almanac, 1949, "January Thaw", "February: Good Oak" & "March: The Geese Return"

Quelle: A Sand County Almanac, 1949, Foreword, p. vii (opening words).

Presumably a paraphrase of "A peculiar virtue in wildlife ethics is that the hunter ordinarily has no gallery to applaud or disapprove of his conduct" or of "Hunting for sport is an improvement ..." above.
Unlikely to be by Leopold, who knew that ethics involves not only doing the right thing, but also determining the right thing in the face of competing desirable criteria.
Misattributed

Quelle: A Sand County Almanac and Sketches Here and There

"The Ecological Conscience" [1947]; Published in The River of the Mother of God and Other Essays by Aldo Leopold, Susan L. Flader and J. Baird Callicott (eds.) 1991, p. 346.
1940s
Quelle: A Sand County Almanac
Kontext: The direction is clear, and the first step is to throw your weight around on matters of right and wrong in land-use. Cease being intimidated by the argument that a right action is impossible because it does not yield maximum profits, or that a wrong action is to be condoned because it pays. That philosophy is dead in human relations, and its funeral in land-relations is overdue.