I really like this quote:

The master in the art of living makes little distinction between his work and his play, his labor and his leisure, his mind and his body, his information and his recreation, his love and his religion. He hardly knows which is which. He simply pursues his vision of excellence at whatever he does, leaving others to decide whether he is working or playing. To him he is always doing both.
— James Michener

David Allen included it in his book Ready for Anything within his chapter called Best is much better than good … How to Be Invincible.

Related post: Make Mine Personal.