Consult not your fears but your hopes and your dreams. Think not about your frustrations, but about your unfulfilled potential. Concern yourself not with what you tried and failed in, but with what it is still possible for you to do.
“Back before 'Brick,' I wrote a short film that I never ended up shooting: hit men in the present who work for a mob in the future who send their victims back in time. A guy is sent his future self, he lets him run, and the whole short was them chasing each other across the city. That sat in a drawer”