It was reported that the great American author Sinclair Lewis was once asked to give a lecture on writing to a  group of college students: "Looking out at this gathering," he said to the assembled students, "makes me want to know how many of you really and truly wish to become writers?" Every hand in the room went up. Lewis looked at them for a moment and then folded his notes and put them away. "If that's true," he said, "then the best advice I can give you is to go home and write." He then turned and left the room.
Science fiction writer, Kurt Vonnegut perhaps says it best: "The only difference between a writer and other human beings is that writer's don't give up".