When you do 'Before Sunset,' you know while it's a limited audience, there was a very small group of people that love 'Before Sunrise.' You feel a certain pressure to make sure that you uphold a level of quality that has been a bar. You set a bar and you have to at least match it.
There seems to be one quality of mind which seems to be of special and extreme advantage in leading him to make discoveries. It was the power of never letting exceptions go unnoticed.