Simply minding one's own business is more offensive than being intrusive. Without ever saying a word one can make a person feel less-than.
As Aristotle said, 'Excellence is a habit.' I would say furthermore that excellence is made constant through the feeling that comes right after one has completed a work which he himself finds undeniably awe-inspiring. He only wants to relax until he's ready to renew such a feeling all over again because to him, all else has become absolutely trivial.