"What you fellows call progress moves by two springs, men and events. But sad to say, from time to time the exceptional is necessary. For events as well as for men, the stock company is not enough; geniuses are needed among men, and revolutions among events. Great accidents are the law; the order of things cannot get along without them; and, to see the apparitions of comets, one would be tempted to believe that Heaven itself is in need of star actors. At the moment you least expect it, God placards a meteor on the wall of the firmament. Some strange star comes along, underlined by an enormous tail. And that makes Caesar die. Brutus strikes him with a knife, and God with a comet."