There's that wonderful line of Rilke's, 'The point of life is to fail at greater and greater things.' Recognising that all our achievements are doomed, in one sense - the earth will be consumed by the sun in a billion years or so - but in another sense the purpose of our journey is to go farther each time. So you're trying things out in every film you make, with the potential of failure. I think we're always failing, in Rilke's sense - we know there's more potential that we haven't realised. But because we're trying, we develop more and more talent, or muscles, or strategies to improve, each time.
The wonderful film editor Walter Murch on success and failure in The Conversations, by Michael Ondaatje