Kung Chi, better known as Tsu Ssu, was the grandson of Confucius and disciple of Tseng Sen. He wrote the Golden Mean", the most representative work on Confucianism. His epigrams for discussing Man’s mind were regarded as the principles of the New Confucians of the Sung and Ming Dynasties. His theory of the Mean has been an important aspect in Chinese philosophy. The "Golden Mean", along with "The Great Learning", "The Confucian Analects", and "Mencius" constitute .the Four Classics in Chinese history. Kung Chi, who felt that teaching the philosophy of his sage ancestor was his responsibility, had several hundreds of students, including Mencius. He died at the age of 62 and was revered as the Shu Sage.

Reference:《THE BRIEF BIOGRAPHIES OF THE SAINTS AND SAGES ARE IN THE TA CHENG HALL OF THE CONFUCIUS TEMPLE》published by Taipei Confucius Temple Governing Board