Years later, when I began to teach, he told me.. "Teach everyone. Anyone like to learn, you teach, no worry. If they bad heart.. not too smart.. they no learn anyhow. Art take care of itself."
Well said, very well said.
I know a few people that like to believe that keep certain things "inside" is good, but all I have seen is that this makes for a slow decay of MA skill.
The more open we are with knowledge and the more it is tested, the better it gets.