A slogan

Dai Sheng's Book of Rites: "Don't climb high, don't go deep, be cautious and don't laugh."

Added as "Listen silently, regard it as invisible, don't climb high, don't go deep, be meticulous, don't laugh." The dutiful son refuses to accept the darkness, does not climb risks, and is afraid of insulting his relatives. "

That is, filial sons often imagine the shape and voice of their parents, do not go to dangerous places, do not work in the dark, and do not laugh casually.