Crossing the Xuzhou

Zhuangzi said: The ark is in the river, and if a hollow boat comes to touch it, even if there are people who are worried about it, they will not be angry. If there is a person on top, call Zhang Shezhi. If you don't hear it when you call out once, then you don't hear it when you call out again, and if you call out evil three times, it will be followed by evil sounds. It was imaginary in the past but it is real now. If a person can make nothing of himself to wander around the world, who can harm him?