Learn the Book of Rites, and then know the shortcomings, and then know the difficulties after teaching. If you don't know enough, then you can reverse; Advance despite difficulties, and then strive for self-improvement. So teaching and learning are also beneficial. Rites are not enough for teachers. The Book of Rites should not be chosen at will. When teaching the Book of Rites, there must be a proper occupation; If you retire, you will learn from the monarch. The Book of Rites is learning, interrogating, pondering, distinguishing and practicing. Everything in the Book of Rites is prepared-preparation is established. If it is not compiled, it will be abolished. In the Book of Rites, clear water means no fish, and people have no disciples. Rites, the way of civil and military, one by one. The study of ceremony is not enough. "Book of Rites" jade is uncut and abrasive; People don't learn or know. "Book of Rites" is not relaxed, so can civil and military; If you can't relax, you will be civil and military, and if you relax, you will be civil and military. If you don't understand the Book of Rites, then you can contradict yourself; Advance despite difficulties, and then strive for self-improvement. The Book of Rites is also a teacher and a metaphor of all virtues.