Humility

Once, as I was directing the woodwind warm-up for marching band, I was incorrectly telling them to do the rhythm in one section of the piece. When we got into the large group for a music rehearsal, the director got upset with the section for doing it wrong. I admitted in front of the entire ensemble, at their aid, that it was I who had made the mistake and told them to do it incorrectly. It took a lot of courage, but i most definitely gained the respect of my section for doing so.
A teacher should never seek confidence and power/control at the expense of humility and truth. Students are smart, they know when you are wrong...and they know when you aren't admitting it. Although it feels like you are losing their respect for making a mistake, it is actually the opposite. Students will respect a teacher more who is willing to admit that they make mistakes, that they have fault, that they are human.
I had a director once who would never admit he was wrong-even when it was blatantly obvious. This caused him to lose, not only respect, but trust from his students. They felt less comfortable to approach him about issues and they just lost trust in the fact that the students were his focus. His inability to say he was wrong made students feel that he cared about himself and his image more than the respect and trust of his students.
Teachers need to realize that image is important in a classroom when it comes to leading by an example and by being a professional. But, their image is not important when it is about being in-charge or being right all the time.
Never sacrifice integrity and humility for pride and power.