Another strain of thought dating to the Warring States Period is the school of yin-yang ( ) and the five elements. The theories of this school attempted to explain the universe in terms of basic forces in nature, the complementary agents of yin (dark, cold, female, negative) and yang (light, hot, male, positive) and the five elements (water, fire, wood, metal, and earth). In later periods these theories came to have importance both in philosophy and in popular belief.
Still another school of thought was based on the doctrine of Mo Zi ( 470-391 B.C.?), or Mo Di. Mo Zi believed that "all men are equal before God" and that mankind should follow heaven by practicing universal love. Advocating that all action must be utilitarian, Mo Zi condemned the Confucian emphasis on ritual and music. He regarded warfare as wasteful and advocated pacificism. Mo Zi also believed that unity of thought and action were necessary to achieve social goals. He maintained that the people should obey their leaders and that the leaders should follow the will of heaven. Although Moism failed to establish itself as a major school of thought, its views are said to be "strongly echoed" in Legalist thought. In general, the teachings of Mo Zi left an indelible impression on the Chinese mind.