Talent isn't enough. You need motivation-and persistence, too: what Steinbeck called a blend of faith and arrogance. When you're young, plain old poverty can be enough, along with an insatiable hunger for recognition. You have to have that feeling of "I'll show them." If you don't have it, don't become a writer.
A novelist must know what his last chapter is going to say and one way or another work toward that last chapter. ... To me it is utterly basic, yet it seems like it's a great secret.