Zou Yan said that "the five virtues are invincible, namely Yu Tu, Natsume, Yin Jin and Zhou Huo." Mu, Jin Kemu, Huo, Shui, Tuke Shui. Because black belongs to water, the Qin Dynasty advocated black. Zou Yan believed that the five virtues represented by the five elements were passed down in the relationship of respecting each other as guests, and later generations also put forward the view that the five elements were coexisting to explain the end of the five virtues.