running a marathon usually seems to be a fine idea. in the middle of a marathon, it seems to be a absolutely horrible idea. towards the end of a marathon, it becomes a better idea again. after finishing a marathon, it's definitely a great idea.
of course, crashing out of a marathon kind of sucks. that's when the letting go of expectations really comes in handy.
hindsight is the clearest, foresight is occasionally clear, the duringsight is the blurriest.