If we are to think of someone besides the father and mother of us. Someone that he khoioprom and give us the knowledge that we accept them, so tired that he could never hope to any reward. Someone who is. Also, no "teacher."
If we think of a person. Besides the father and our mother. One look at his training. And deliver knowledge to us. We are not tired That he never paid any hope that someone who is not in "teacher".
If we think of someone. In addition, our father and mother, someone he"s been training and give knowledge to us. He tired to us. He never expect anything in return. Who"s who, unless "teacher."