Humility

One virtue that coincides with confidence is humility.  Without the proper amount of humility confidence can quickly turn into ego and the validity of a teacher is doubted.  As a teacher, student, husband, or anyone for that  matter you will have to be able to fess up to the fact that you are not always going to be right.  It's alright to admit that you're human, and in most cases it is better that people realize that you don't think so highly of yourself that you can't make a mistake.  We're human, of course we make mistakes, but being a humble person doesn't mean that when we make a mistake that we dwell on it.  When a good teacher makes a mistake they first admit that they made an error, they resolve the issue, then they continue on.  Some teachers have such confidence in themselves that they feel that they can not make a mistake and when they are accused of doing so they are to cocky to let themselves be humiliated.  To be a successful teacher it requires being able to admit to mistakes when they are made and then have the confidence to pick yourself up afterwards and move on with the lesson.  Another part of humility that some very successful people have trouble with is not "blowing your own horn" so to speak.  If you are a person with a highly sophisticated background or a plethora of achievements those achievements will still be there for people to know about without you gloating about it.  If someone wants to know about your life of achievement they will ask, you don't need to talk about it.