Conservation is a positive exercise of skill and insight, not merely a negative exercise of abstinence and caution.

The last word in ignorance is the man who says of an animal or plant: 'What good is it?

I love all trees, but I am in love with pines.

Examine each question in terms of what is ethically and aesthetically right, as well as what is economically expedient.

The richest values of wilderness lie not in the days of Daniel Boone, nor even in the present, but rather in the future.

Education, I fear, is learning to see one thing by going blind to another.

What a dull world if we knew all about geese!