Reference: If you don't learn etiquette, you can't stand it. Excerpted from Article 16 of the Analects of Confucius.
Interpretation: Learning etiquette is meticulous and clear, and virtue is firm, so it can stand.
Morality, courtesy, frugality and respect are the foundation of a person's life. Politeness is safe, rudeness is dangerous. Therefore, if you don't learn etiquette, you can't stand it.