Zisi (Chinese: 子思; pinyin: Zǐsī; Wade–Giles: Tzu-ssu; ca. 481–402 BCE), born Kong Ji (孔伋), was a Chinese philosopher. Zisi, who was the only grandson of Confucius, supposedly taught Mencius and wrote the Doctrine of the Mean. He is honorifically called Zisizi (子思子, "Master Zisi").
Where his grandfather began to distinguish between true and supposed knowledge, Zisi proceeded upon meditations on the relativity in human knowledge of the universe. He attempted to analyze as many types of action as possible, and believed that wise people who are conscious of their moral and intellectual duties can copy the reality of the universe into themselves.
On par with Mencius, Zisi is attacked by Xunzi in his famous "Against Twelve Masters" chapter. The target of Xunzi's attack is the Wuxing teaching. The extant version of the book of the same name is ascribed to Zisi.
See also 
- ^ Ames, Roger T. and David L. Hall (2001). Focusing the Familiar: A Translation and Philosophical Interpretation of the Zhongyong. University of Hawaii Press. p. 132. ISBN 9780824824600.