Mary had practiced her recital piece for an hour. She still couldn’t get it right. She threw her music to the floor and stormed from the room. She told her mother that she was just going to quit piano because she would never learn to play her recital piece. Her mother told her to give it time. She explained that it took more than one practice session to learn a piano piece. She told her that if she would practice her piece every day, eventually she would learn it. Mary wasn’t sure she agreed, but for the next week she practiced every day. To her surprise one day, she realized that she had played her piece perfectly. Her mom had been right after all.

What is the theme of the above passage?