Wang Duxing: Duxing means to implement it earnestly and concentrate on it.
"Book of Rites: Confucianism": "A Confucian is knowledgeable but not exhausted, and practices diligently without being tired. "Practice diligently" is the final stage of learning, that is, since you have learned something, you must work hard to practice what you have learned. Learning means to finally implement what you learn and achieve "unity of knowledge and action". "Du" means loyalty, down-to-earthness, single-mindedness and perseverance. Only those with clear goals and firm will can do it. Truly "practice"