Confidence

1.	full trust; belief in the powers, trustworthiness, or reliability of a person or thing: We have every confidence in their ability to succeed.

2.	belief in oneself and one's powers or abilities; self-confidence; self-reliance; assurance: His lack of confidence defeated him.

3.	certitude; assurance: He described the situation with such confidence that the audience believed him completely.

I think confidence is about knowing your limits and being able to reach your limits.