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It is a famous saying of Zhang Zai, a famous figure in the Northern Song Dynasty, that "make a heart for heaven and earth, make a life for the people, link the past with the future, and make the world peaceful". Feng Youlan, a contemporary philosopher, called it "four sentences in a horizontal canal". Because of its conciseness, it has always been praised by people.
Zhang Zai (1020- 1077), a great scholar, philosopher, one of the founders of Neo-Confucianism, the founder of the branch of Neo-Confucianism, and Feng, the 38th saint of XiConfucius Temple. Born in Daliang (now Kaifeng, Henan), he immigrated to Hengqu Town, Jixian County (now Meixian County, Shaanxi Province). Scholars call him Mr. Hengqu. Song Renzong Jiayou was a scholar in the second year, and was awarded calligraphy in Chongwen Academy. Later, his younger brother, Zhang Jian, was demoted for opposing Wang Anshi's political reform, and Hengqu resigned. After returning home, he devoted himself to reading and giving lectures, and created Guan Xue, which became famous for a while. Song Shenzong died in Tongguan in the tenth year of Xining (1077).