Source: The Book of Rites: "What is benevolence and righteousness? Father's kindness, son's filial piety, brother's kindness, brother's kindness, husband's righteousness, woman's listening, long-term benefit, gentleness, gentleman's benevolence and minister's loyalty. "
Wang Xiang was lying on the ice, and Wang Xiang was lying on the ice begging the fish to serve his mother. Metaphor children filial piety parents.