True mastery transcends any particular art. It stems from mastery of oneself--the ability, developed through self-discipline, to be calm, fully aware, and completely in tune with oneself and the surroundings. Then, and only then, can a person know himself.

One can have no smaller or greater mastery than mastery of oneself.

You will never have a greater or lesser dominion than that over yourself...the height of a man's success is gauged by his self-mastery; the depth of his failure by his self-abandonment. ...And this law is the expression of eternal justice. He who cannot establish dominion over himself will have no dominion over others.

Knowing others is intelligence; knowing yourself is true wisdom. Mastering others is strength; mastering yourself is true power.

Facing yourself can be intimidating, but that is only until it is liberating.

A man has to learn that he cannot command things, but that he can command himself; that he cannot coerce the wills of others, but that he can mold and master his own will: and things serve him who serves Truth; people seek guidance of him who is master of himself.