You have practiced all of your life to be what you are, and you do it so well that you master what you believe you are. You master your own personality, your own beliefs; you master every action, every reaction. You practice for years and years, and you achieve the level of mastery to be what you believe you are. Once we can see that all of us are masters, we can see what kind of mastery we have.

Translation: change what you believe, and the reality you take for granted holds alternate meaning.