“...but there is every reason to think that the bulging cortex which would later measure stars and ice ages was still a dim, impoverished region in a skull box whose capacity was no greater than that of great apes.”

“When man becomes greater than nature, nature, which gave us birth, will respond.”

“And there was no longer a single race who bred blindly and without question. Time and its agonizing nostalgia would touch the heart each season, and be seen in the fall of a leaf, or, most terrible of all, a loved face would grow old. Cronos and the Fates had entered man's thinking, and try to escape as he might, he would endure an interior Ice Age. He would make, and then unmake fables. Then at last, and unwillingly, comprehend an intangible abstraction called space-time, and shiver inwardly at the endless abysses of space as he had once shivered, unclothed and unlighted before the Earthly frost.”

“There is nothing more alone in the universe than man. He is alone because he has the intellectual capacity to know that he is separated by a vast gulf of social memory and experiment from the lives of his animal associates.”

“Since the first human eye saw a leaf in Devonian sandstone and a puzzled finger reached to touch it, sadness has lain over the heart of man. By this tenuous thread of living protoplasm, stretching backward into time, we are linked forever to lost beaches whose sands have long since hardened into stone. The stars that caught our blind amphibian stare have shifted far or vanished in their courses, but still that naked, glistening thread winds onward. No one knows the secret of its beginning or its end. Its forms are phantoms. The thread alone is real; the thread is life.”

“The need is not really for more brains, the need is now for a gentler, a more tolerant people than those who won for us against the ice, the tiger and the bear. The hand that hefted the ax, out of some old blind allegiance to the past fondles the machine gun as lovingly. It is a habit man will have to break to survive, but the roots go very deep.”

“Man would not be man if his dreams did not exceed his grasp. ... Like John Donne, man lies in a close prison, yet it is dear to him. Like Donne's, his thoughts at times overleap the sun and pace beyond the body. If I term humanity a slime mold organism it is because our present environment suggest it. If I remember the sunflower forest it is because from its hidden reaches man arose. The green world is his sacred center. In moments of sanity he must still seek refuge there. ... If I dream by contrast of the eventual drift of the star voyagers through the dilated time of the universe, it is because I have seen thistledown off to new worlds and am at heart a voyager who, in this modern time, still yearns for the lost country of his birth.”