Respect

Respect is when a person is held to a high standard. The person who is held in respect has worked for some time at getting that type of treatment. Having respect means there is no longer a need to motivate the followers to give respect. It is an intangible thing that makes a person want to do things for the person they have respect for. Without respect, a person is not well trusted, liked, and even not welcome sometimes. If you don't respect someone, you don't even want to be in their presence.
In a classroom setting, if the teacher has respect from their students then the class will naturally be quiet. In my experience throughout high school and college the more the teacher is respected the more focused the class is. If the teacher is respected the class will know that the teacher is trustworthy and will enjoy listening to them.
I would say that the easiest way to earn respect is to find out about the kid's lives. If the teacher knows of a common interest then they can build a relationship through that. This would then start the trust in the relationship. But, the teacher must also be very careful in this stage to be totally honest because the student is very vulnerable and is not looking to trust the teacher yet. There must first be a reason to trust and respect. Without this key stage in the classroom there can be no real respect for a teacher.