Zhang Yinyu's "Research on Excessive Virtue" is an outstanding treatise by a Chinese philosopher and writer of the Ming Dynasty. The author offers the reader a deep sense of humanism and an understanding of the essence of human nature, developing the concept of suspicion and critical thinking in relation to integrity. In his work, Zhang Yinyu raises relevant questions of morality, ethics and truthfulness, thanks to which "The Study of Excessive Virtue" remains an important source of knowledge about the moral values of Chinese culture.