I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority.
Elwyn Brooks White

Man must feel the earth to know himself and recognize his values.... God made life simple. It is man who complicates it.
Charles A. Lindbergh

Climb the mountains and get their good tidings. Nature's peace will flow into you as sunshine flows into trees. The winds will blow their own freshness into you, and the storms their energy, while cares will drop off like autumn leaves.
John Muir

There is a pleasure in the pathless woods,
There is a rapture on the lonely shore,
There is society, where none intrudes,
By the deep sea, and music in its roar:
I love not man the less, but Nature more.
George Gordon,

Only when the last tree has died and the last river been poisoned and the last fish been caught will we realise we cannot eat money.
Cree Indian Proverb

We do not inherit the earth from our ancestors, we borrow it from our children.
Native American Proverb

To see the EARTH as we now see it, small and beautiful in that eternal silence where it floats, is to see ourselves as riders on the EARTH together, brothers on that bright loveliness in the unending night -- brothers who see now they are truly brothers.
Archibald Macleish