Nature never did betray the heart that loved her.

—William Wordsworth

We could have saved the Earth but we were too damned cheap.

 —Kurt Vonnegut Jr

Because we don’t think about future generations, they will never forget us.

 —Henrik Tikkanen

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

 —Richard P. Feynman

When one tugs at a single thing in nature, he finds it attached to the rest of the world.

—John Muir

The old Lakota was wise. He knew that man’s heart away from nature becomes hard; he knew that lack of respect for growing, living things soon led to lack of respect for humans too.

—Chief Luther Standing Bear

The universe is not required to be in perfect harmony with human ambition.

—Carl Sagan

A human being is part of the whole, called by us “Universe,” a part limited in time and space. He experiences himself, his thoughts and feelings as something separated from the rest — a kind of optical delusion of his consciousness. This delusion is a kind of prison for us, restricting us to our personal desires and to affection for a few persons nearest to us. Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole [of] nature in its beauty.

 —Albert Einstein

If all mankind were to disappear, the world would regenerate back to the rich state of equilibrium that existed ten thousand years ago. If insects were to vanish, the environment would collapse into chaos.

—Edward O. Wilson

To live a pure unselfish life, one must count nothing as one’s own in the midst of abundance.

—Buddha

The tree which moves some to tears of joy is in the eyes of others only a green thing that stands in the way. Some see nature all ridicule and deformity ... and some scarce see nature at all. But to the eyes of the man of imagination, nature is imagination itself.

—William Blake