"<p>Matter is an unceasingly flowing river; the activity of nature manifests itself in continuous change, the ultimate cause is hidden in a tangle of thousands and thousands of twists and turns. Almost nothing is permanent, and the bottomless, all-consuming depth of the past and future lies at our feet. How foolish would he be if he puffs up or frets or wails in such circumstances, as if something could cause discomfort, either for a while or more permanently.</p>"