This is an ancient poem by China, which means: "Know little manners, and there is no right and wrong in your heart. Pay attention to the details of behavior, but despise the atmospheric festival. Those who dare not act by force oppress those who are weaker than themselves. "
This sentence means to emphasize that people should pay attention to right and wrong, morality and shame, and don't pay too much attention to important things. At the same time, this sentence also reminds people to avoid bullying and to respect and sympathize with the weak.