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.
Many times in life, we are held back from achieving our goals because we do not commit ourselves wholeheartedly. With an escape route in mind, we hold ourselves back from giving our all.
Who you are tomorrow begins with what you do today.
The bird dares to break the shell, then the shell breaks open and the bird can fly openly. This is the simplest principle of success. You dream, you dare and and you fly.