I hear, and I forget
I see, and I remember
I do, and I understand
- Chinese proverb
Dave Lowry wrote that the martial art practiced by the Japanese swordsmen of the Yagyu Shinkage Ryu endured past feudal times because, "Men who cared more for its philosophy and ethics than for its murderous techniques passed on the teaching with the loving respect with which outstanding individuals have always regarded something of value."
This is what taekwondo instructors do. They love and respect taekwondo as something of great value to society and they want to pass its philosophy and ethics on to their students. Instructor teach students; the students learn and supply feedback to the instructors, who learn from the students. The desire of every instructor to have his or her students surpass him or her as a martial artist.
Instructors usually learn their teaching techniques from their observation of all their past instructors. If their instructors had any bad teaching habits, they were probably passed on to their students who later decided to teach. Some national taekwondo organizations have strict certification standards for their instructors. This certification process ensures the quality of the instructors and ensures students receive quality instruction.