You should bring something into the world that wasn't in the world before. It doesn't matter what that is. It doesn't matter if it's a table or a film or gardening - everyone should create. You should do something, then sit back and say, 'I did that'.
Don't become something just because someone else wants you to, or because it's easy; you won't be happy. You have to do what you really, really, really, really want to do, even if it scares the shit out of you.
'You see, Momo,' he told her one day, 'it's like this: Sometimes, when you've a very long street ahead of you, you think how terribly long it is and feel sure you'll never get it swept.'
He gazed silently into space before continuing. 'And then you start to hurry,' he went on. 'You work faster and faster, and every time you look up there seems to be just as much left to sweep as before, and you try even harder, and you panic, and in the end you're out of breath and have to stop - and still the street stretches away in front of you. That's not the way to do it.'
He pondered a while. Then he said, 'You must never think of the whole street at once, understand? You must only concentrate on the next step, the next breath, the next stroke of the broom, and the next, and the next. Nothing else.'
Again he paused for thought before adding, 'That way you enjoy your work, which is important, because then you make a good job of it. And that's how it ought to be.'