Look up at the miracle of the falling snow,—the air a dizzy maze of whirling, eddying flakes, noiselessly transforming the world, the exquisite crystals dropping in ditch and gutter, and disguising in the same suit of spotless livery all objects upon which they fall.

If we take science as our sole guide, if we accept and hold fast that alone which is verifiable, the old theology must go.

[Theodore Roosevelt] was a naturalist on the broadest grounds, uniting much technical knowledge with knowledge of the daily lives and habits of all forms of wild life. He probably knew tenfold more natural history than all the presidents who had preceded him, and, I think one is safe in saying, more human history also.

You cannot use [nuclear weapons] to target civilians; you cannot use them against military targets if they have indiscriminate effects on civilians in addition to the attack on the military target.

I think rain is as necessary to the mind as to vegetation. My very thoughts become thirsty, and crave the moisture.

If I were to name the three most precious resources of life, I should say books, friends, and nature.

Every walk to the woods is a religious rite, every bath in the stream is a saving ordinance. Communion service is at all hours, and the bread and wine are from the heart and marrow of Mother Earth.