Aldo Leopold: Thing

“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.”

Aldo Leopold book A Sand County Almanac

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.

Beauty , Communication

“We all strive for safety, prosperity, comfort, long life, and dullness. The deer strives with his supple legs, the cowman with trap and poison, the statesman with pen, the most of us with machines, votes, and dollars, but it all comes to the same thing: peace in our time. A measure of success in this is all well enough, and perhaps is a requisite to objective thinking, but too much safety seems to yield only danger in the long run. Perhaps this is behind Thoreau’s dictum: In wildness is the salvation of the world. Perhaps this is the hidden meaning in the howl of the wolf, long known among mountains, but seldom perceived among men.”

Aldo Leopold book A Sand County Almanac

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

Life , Men , World , Peace

“Education, I fear, is learning to see one thing by going blind to another.”

Aldo Leopold book A Sand County Almanac

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

Education , Fear , Learning

“When I call to mind my earliest impressions, I wonder whether the process ordinarily referred to as growing up is not actually a process of growing down; whether experience, so much touted among adults as the thing children lack, is not actually a progressive dilution of the essentials by the trivialities of living.”

Aldo Leopold book A Sand County Almanac

“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,"

Children

“He who hopes for spring with upturned eye never sees so small a thing as Draba. He who despairs of spring with downcast eye steps on it, unknowingly. He who searches for spring with his knees in the mud finds it, in abundance.”

Aldo Leopold book A Sand County Almanac

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

Hope , Search , Spring , Despair

“Man always kills the thing he loves, and so we the pioneers have killed our wilderness. Some say we had to. Be that as it may, I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?”

Aldo Leopold book A Sand County Almanac

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

Love , Freedom , Country

“There are some who can live without wild things, and some who cannot. These essays are the delights and dilemmas of one who cannot.”

Aldo Leopold book A Sand County Almanac

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

“Ethical behavior is doing the right thing when no one else is watching — even when doing the wrong thing is legal.”

Aldo Leopold

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

Behavior

“We shall never achieve harmony with land, any more than we shall achieve justice or liberty for people. In these higher aspirations the important thing is not to achieve, but to strive. … The problem, then, is how to bring about a striving for harmony with land among a people many of whom have forgotten there is any such thing as land, among whom education and culture have become almost synonymous with landlessness. This is the problem of 'conservation education.”

Aldo Leopold

"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

People , Education , Justice , Problem

“Is education possibly a process of trading awareness for things of lesser worth? The goose who trades his is soon a pile of feathers.”

Aldo Leopold book A Sand County Almanac

“March: The Geese Return”, p. 18.
A Sand County Almanac, 1949, "January Thaw", "February: Good Oak" & "March: The Geese Return"
Source: A Sand County Almanac and Sketches Here and There

Education

“Man brings all things to the test of himself, and this is notably true of lightning.”

Aldo Leopold book A Sand County Almanac

“February: Good Oak”, p. 8.
A Sand County Almanac, 1949, "January Thaw", "February: Good Oak" & "March: The Geese Return"

“Barring love and war, few enterprises are undertaken with such abandon, or by such diverse individuals, or with so paradoxical a mixture of appetite and altruism, as that group of avocations known as outdoor recreation. It is, by common consent, a good thing for people to get back to nature. But wherein lies the goodness, and what can be done to encourage its pursuit?”

Aldo Leopold book A Sand County Almanac

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

Love , War , People , Nature

“How like fish we are: ready, nay eager, to seize upon whatever new thing some wind of circumstance shakes down upon the river of time! … Even so, I think there is some virtue in eagerness, whether its object prove true or false.”

Aldo Leopold book A Sand County Almanac

“June: The Alder Fork”, p. 39.
A Sand County Almanac, 1949, "May: Back from the Argentine," "June: The Alder Fork," "July: Great Possessions," and "July: Prairie Birthday"

Thinking , Fish , Time , Falseness

“On a fair morning the mountain invited you to get down and roll in its new grass and flowers (your less inhibited horse did just this if you failed to keep a tight rein). Every living thing sang, chirped, and burgeoned. Massive pines and firs, storm-tossed these many months, soaked up the sun in towering dignity. Tassel-eared squirrels, poker-faced but exuding emotion with voice and tail, told you insistently what your already knew full well: that never had there been so rare a day, or so rich a solitude to spend it in.”

Aldo Leopold book A Sand County Almanac

“Arizona and New Mexico: On Top”, p. 125.
A Sand County Almanac, 1949, "Arizona and New Mexico: On Top," & "Arizona and New Mexico: Thinking Like a Mountain"

Mountain , Flowers , Solitude , Grass

“Conservation is not merely a thing to be enshrined in outdoor museums, but a way of living on land.”

Aldo Leopold

" Game Cropping in Southern Wisconsin http://digicoll.library.wisc.edu/cgi-bin/AldoLeopold/AldoLeopold-idx?type=turn&id=AldoLeopold.ALReprints&entity=AldoLeopold.ALReprints.p0692&isize=XL", Our Native Landscape; Published by "The Friends of Our Native Landscape," October 1927.
1920s

Way

“An ethic, ecologically, is a limitation on freedom of action in the struggle for existence. An ethic, philosophically, is a differentiation of social from anti-social conduct. These are two definitions of one thing. The thing has its origin in the tendency of interdependent individuals or groups to evolve modes of co-operation. The ecologist calls these symbioses. Politics and economics are advanced symbioses in which the original free-for-all competition has been replaced, in part, by co-operative mechanisms with an ethical content.”

Aldo Leopold book A Sand County Almanac

Source: A Sand County Almanac, 1949, "The Land Ethic", p. 202.

Freedom , Parting

“Above all we should, in the century since Darwin, have come to know that man, while now captain of the adventuring ship, is hardly the sole object of its quest, and that his prior assumptions to this effect arose from the simple necessity of whistling in the dark.
These things, I say, should have come to us. I fear they have not come to many.”

Aldo Leopold book A Sand County Almanac

“Wisconsin: On a Monument to the Pigeon”, p. 110.
A Sand County Almanac, 1949, "Wisconsin: Marshland Elegy," "Wisconsin: The Sand Counties" "Wisconsin: On a Monument to the Pigeon," and "Wisconsin: Flambeau"

Fear

“The erasure of a human subspecies is largely painless — to us — if we know little enough about it. A dead Chinaman is of little import to us whose awareness of things Chinese is bounded by an occasional dish of chow mein. We grieve only for what we know. The erasure of Silphium from western Dane County is no cause for grief if one knows it only as a name in a botany book.”

Aldo Leopold book A Sand County Almanac

“July: Prairie Birthday”, p. 48.
A Sand County Almanac, 1949, "May: Back from the Argentine," "June: The Alder Fork," "July: Great Possessions," and "July: Prairie Birthday"

Books , Dead

“That biological jack-of-all-trades called ecologist tries to be and do all these things. Needless to say, he does not succeed.”

Aldo Leopold

" The Deer Swath http://digicoll.library.wisc.edu/cgi-bin/AldoLeopold/AldoLeopold-idx?type=turn&entity=AldoLeopold.ALDeskFile.p0799&id=AldoLeopold.ALDeskFile&isize=L" [1948]; Published in Round River, Luna B. Leopold (ed.), Oxford University Press, 1966, p. 127.
1940s

“Once you learn to read the land, I have no fear of what you will do to it, or with it. And I know many pleasant things it will do to you.”

Aldo Leopold

"Wherefore Wildlife Ecology?" [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. 337.
1940s

Fear , Learning , Reading