first, the essence of ceremony is benevolence. Confucius said, "Li Yun Li Yun! Jade and silk clouds! Le Yun Le Yun! The drums are clouds! " Second, the ceremony should have a form. 3.17 Zigong wants to tell the sheep. Confucius said, "Give it! I love my sheep, and I love my ceremony. " Third, we must inherit the ancient ceremony. 3. Zhang asked: "Do you know the tenth?" Confucius said, "Yin gained and lost because of Xia Li, so we can know; It is clear that Zhou gained and lost because of Yin Li. Its successor, though immortal, can be known. " 3.9 Confucius said: "Xia Li, I can say it, and it is not enough to levy it; Yin Li, what I can say, is not enough in Song Dynasty. The literature is insufficient. Enough, then we can levy it. " 3.14 Confucius said, "Zhou Jian is in the second generation, and he is so depressed! I am from Zhou. " 3.16 Confucius said, "You can't shoot the main skin, because the strength is different, and the ancient way is also."