The responsibility of the Sensei is that he shares his/her nuggets of knowledge with the hope that the students applies these nuggets of knowledge. When they are applied they become gems of wisdom. When that wisdom becomes internalized, it becomes understanding and when you understand something you know it.
The discipline, perseverance and hard work ethic necessary to excel in ones art should challenge each student to the threshold of their limits. It is the desire of every authentic teacher to want the best from each student. My Sensei, Dr. Karl W Marx Sr. founder of Keicho-Do, once told me, “A student is a reflection of his Sensei.” So each teacher is also challenged to impart knowledge that years of study and applying that knowledge, to each student that walks into ones school. Funakoshi Sensei, Founder of Shotokan, said that the purpose of karate is to develop the character of the individual practitioner.