Next to the laborer in the fields, the walker holds the closest relation to the soil; and he holds a closer and more vital relation to nature because he is freer and his mind more at leisure.

Every twenty minutes on the Appalachian Trail, Katz and I walked farther than the average American walks in a week. For 93 percent of all trips outside the home, for whatever distance or whatever purpose, Americans now get in a car. On average the total walking of an American these days - that's walking of all types: from car to office, from office to car, around the supermarket and shopping malls - adds up to 1.4 miles a week, barely 350 yards a day.

Cedars are terribly sensitive to change of time and light - sometimes they are bluish cold-green, then they turn yellow warm-green - sometimes their boughs flop heavy and sometimes float, then they are fairy as ferns and then they droop, heavy as heartaches.

The Nation that destroys its soil destroys itself.

Mountains are not stadiums where I satisfy my ambition to achieve, they are the cathedrals where I practice my religion.

When you get into the whole field of exploring, probably 90 percent of the kinds of organisms, plants, animals and especially microorganisms and tiny invertebrate animals are unknown. Then you realize that we live on a relatively unexplored plan.