" Your breath comes short and quick, you are feverish with excitement; the dinner-bell may ring its clapper off, you pay no attention; friends may die, weddings transpire, houses burn down, they are nothing to you; you sweat and dig and delve with a frantic interest—and all at once you strike it! Up comes a spadeful of earth and quartz that is all lovely with soiled lumps and leaves and sprays of gold. Sometimes "

― Mark Twain , Roughing It