Humility

I have been wrong plenty of times in my life. Usually it is when I think I am right and I think I can prove it but then I can't. I think the balance would be that admit what you know (that's where the confidence comes into play) and then admitting that you don't know everything and that you are wrong sometimes (that's where genuine humility comes in). There are times when teachers will have to admit that they are wrong and can't always know everything.