A master can tell you what he expects of you. A teacher, though, awakens your own expectations.
Quite honestly I never had a desire to be an actor. I tell people, I did not choose acting acting chose me. I never grew up wanting to be an actor. I wanted to play football. In about 9th grade an English teacher told me I had a talent to act. He said I should audition for a performing arts high school so I did on a whim. I got accepted.
It was my family that wanted me to be a teacher. That was safe, you see. To be a painter was terrible.