When I become a teacher, I get some experience about teaching a class. I learn that if you become a teacher you have to make yourself interesting so the student will pay attention to you. Without their attention the materi of the lesson will not be accepted well by the students. And you have to manage your materi sytematical, so the materi will not be a boring one. With this experience, I learn that you got yourself abondoned, you will feel sick in your heart. So you have prepare yourself to be hurt by your students. And forget you have to master the materi before you tell to the students.