When they lose their sense of awe, people turn to religion. When they no longer trust themselves, they begin to depend upon authority. Therefore the Master steps back so that people won't be confused. He teaches without a teaching, so that people will have nothing to learn.
Better stop short than fill to the brim. Oversharpen the blade, and the edge will soon blunt. Amass a store of gold and jade, and no one can protect it.