Iran's ancient folklore tells us that true champions ("Pahhlavaan"s) are those who are both physically and behaviorally perfect, meaning that they are truly modest whilst being truly powerful. Its almost impossible to pull off, but that's what I'm trying to go for.
Strive to learn your limits. By knowing your capacity and capabilities well, you'll have the confidence you need. At least, that's what I've been told. My confidence is da shitz