Zhang Zai (1020-1077, courtesy name Zihou) was a Chinese philosopher in the Northern Song Dynasty. His ancestral home is Daliang (now Kaifeng, Henan), born in Chang'an (now Xi'an, Shaanxi), and later lived in Hengqu (now Hengqu Town, Mei County, Shaanxi). His famous saying "Four Sentences in Hengqu" is widely circulated: establish a heart for the heaven and earth, establish a destiny for the people, carry forward the unique knowledge for the saints, and create peace for all generations.

In modern language, "establishing a heart for heaven and earth" means that "scholars should use spiritual power (heart) to understand the nature and laws of the objective world (heaven and earth), and establish a solid rationality for people to transform the objective world. "Basic."

In modern language, "building a life for the people" means "scholars should care about the people's destiny, reflect the people's aspirations, alleviate the people's suffering, and enhance the people's well-being."

In modern language, "carrying on the unique learning for the past saints" means that "scholars must critically inherit the academic achievements of their predecessors, create new scientific theories, and continue human civilization through publicity, education, and promotion." ”

In modern language, “creating peace for all generations” means that “scholars must have lofty social ideals, safeguard the positive progressive factors in society, criticize the negative and backward things in society, and pay tribute to People point the way to a bright future.”