Writers write, and they write, and they go on writing, in some cases long after wisdom and even common sense have told them to quit. There are always plenty of reasons—good, compelling reasons, too—for quitting, or for not writing very much or very seriously. (Writing is trouble, make no mistake, for everyone involved, and who needs trouble?) But once in a great while lightning strikes, and occasionally it strikes early in the writer’s life. Sometimes it comes later, after years of work. And sometimes, most often, of course, it never happens at all…. But it will never, never happen to those who don’t work hard at it and who don’t consider the act of writing as very nearly the most important thing in their lives, right up there next to breath, and food, and shelter, and love, and God.
—Raymond Carver (introduction, Best American Short Stories 1986)