A major difference between the mere acquisition of skill and the embodiment of mastery is refinement. This refers not to the mere possession of a certain trait, but the comfortable and confident application of it regardless of external limitations. It is when through practice a skill becomes second-nature, fine-tuned to the specific qualities and traits of its practicioner, smooth and polished.
Consider a musician that learns a new piece. He may be a very achieved musician indeed, with a high degree of skill. Certainly, in his hands, the instrument will perform the piece better than even the most practiced beginner. However, every expert knows the difference between good and really good, or natural, when all the kinks have been worked out and both the musician and the instrument compliment each other in the creation of music.
A state of true accomplishment and flow cannot happen without refinement, which is achieved through practice, experience, and diversified application of a skill or trait, which is necessary for fluidity and the ability to integrate and apply a skill to different situations


Elements of Mastery