Human history is a brief spot in space, and its first lesson is modesty. At any moment a comet may come too close to the earth and set our little globe turning topsy-turvy in a hectic course, or choke its men and fleas with fumes or heat; or a fragment of the smiling sun may slip off tangentially—as some think our planet did a few astronomic moments ago—and fall upon us in a wild embrace ending all grief and pain.
