Sight is a faculty; seeing is an art.

Man has too long forgotten that the earth was given to him for usufruct alone, not for consumption, still less for profligate waste.

The equation of animal and vegetable life is too complicated a problem for human intelligence to solve, and we can never know how wide a circle of disturbance we produce in the harmonies of nature when we throw the smallest pebble into the ocean of organic life.

All Nature is linked together by invisible bonds and every organic creature, however low, however feeble, however dependent, is necessary to the well-being of some other among the myriad forms of life.

The great question, whether man is of nature or above her.

Apart from the hostile influence of man, the organic and the inorganic world are ... bound together by such mutual relations and adaptations s secure, if not the absolute permanence and equilibrium of both ... at least a very slow and gradual succession of changes in those conditions. But man is everywhere a disturbing agent. Wherever he plants his foot, the harmonies of nature are turned to discords.

When not protected by law, by popular favor or superstition, or by other special circumstances, [birds] yield very readily to the influences of civilization, and, though the first operations of the settler are favorable to the increase of many species, the great extension of rural and of mechanical industry is, in a variety of ways, destructive even to tribes not directly warred upon by man.