In Yan Zhitui's "Yan Family Instructions Mu Xian" in the Northern Qi Dynasty, when people are teenagers, their expressions are uncertain, they are confused with each other, they are stuck in pottery, talking and laughing, they have no intention of learning, and they gradually drift away, which is natural. It means that people's thoughts or personalities are unconsciously infected, influenced and changed. Metaphor means that people are changed unconsciously.
Popular literature should have a subtle effect, replacing dirty and narrow interests such as old books and plays with pure and extensive interests. On Zhu Ziqing's Popular Literature Everything parents say and do will exert a subtle influence on their children.