Just do it, as NIKE would say. And I agree, it might be the best quote ever. If you don't think but just do what you want, live might be better. So why not try it? (Sorry for the language, I love this quote!
A mentally unstable Vietnam war veteran works as a night-time taxi driver in New York City where the perceived decadence and sleaze feeds his urge for violent action, attempting to save a preadolescent prostitute in the process.