The guru or teacher is a gate through which you pass. They provide an outlet for you; as a catalytic agent; stirring that which is already within you. The guru leads you within and helps you eliminate mistakes so you grow quickly on the spiritual path. She is a vehicle for your spiritual growth, for you to work out problems and transcend the limited ego.
The guru becomes a mirror for you. When you stand in front of her, she reflects whatever you are. But as you move away, she does not hold on to that reflection. When someone else comes, they will see only their own image and not the image of others. The guru does not hold any concepts or beliefs about you. She is continuously open to all human beings in every situation.