We are social animals. We like to feel a part of something of beauty and power that transcends our insignificance. It can be a religion, a political party, a ball club. Why not also Nature? I feel a strong identity with the world of living things. I was born into it; we all were. But we may not feel the ties unless we gain intimacy by seeing, feeling, smelling, touching and studying the natural world. Trying to live in harmony with the dictates of nature is probably as inspirational as living in harmony with the Koran or the Bible. Perhaps it is also a timely undertaking.

Barry L. Jacobs and colleagues from the neuroscience program at Princeton University showed that when mice ran every day on an exercise wheel, they developed more brain cells and they learned faster than sedentary controls. I believe in mice.

Running is perhaps the most fundamental of all sports, and it is economically the least costly to perform. As a consequence, it is the most democratic and most competitive of all sports because individual merit can prevail despite economic equality. It is a sport for everyone, the whole world over.

There is nothing quite so gentle, deep, and irrational as running--and nothing quite so savage, so wild.

I do not yet want to form a hypothesis to test, because as soon as you make a hypothesis, you become prejudiced. Your mind slides into a groove, and once it is in that groove, has difficulty noticing anything outside of it. During this time, my sense must be sharp; that is the main thing - to be sharp, yet open.

Movement is the essence of life.

The very idea of "managing" a forest in the first place is oxymoronic, because a forest is an ecosystem that is by definition self-managing.