" 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. "

― Loren Eiseley , The Unexpected Universe