‘… I suppose one night hundreds of thousands of years ago in a cave by a night fire when one of those shaggy men wakened to gaze over the banked coals at his woman, his children, and thought of their being cold, dead, gone forever. Then he must have wept. And he put out his hand in the night to the woman who must die some day and to the children who must follow her. And for a little bit the next morning, he treated them some-what better, for he saw that they, like himself, had the seed of night in them. He felt that seed like slime in his pulse, splitting, making more against the day they would multiply his body into darkness. So that man, the first one, knew what we know now: our hour is short, eternity is long. With this knowledge came pity and mercy, so we spared others for the later, more intricate, more mysterious benefits of love.’

Ray Bradbury, Something Wicked This Way Comes