Make a heart for heaven and earth, make a life for the people, link the past with the future, and create peace for all generations. These four sentences are the end-result of Zhang Zai's lifelong study in the Northern Song Dynasty and the essence of his thoughts. Mr. Feng Youlan called it "four sentences in a horizontal canal".

Zhang Zai (1020- 1077), a native of Hengqu Town, Meixian County, Shaanxi Province, was a famous thinker and educator in the Northern Song Dynasty, one of the founders of Neo-Confucianism, and the founder of Guan Xue. He was praised as "Mr. Hengqu" by the world.

Zhang Zai s "Heart of Heaven and Earth";

That is, the law of the movement and change of things revealed is simple dialectical materialism based on Yi-ology philosophy. "Book of Rites" says: "People are the heart of heaven and earth, the end of the five elements, taste, not words, color and life."

Heaven, earth and man are an organic whole, and man is the knower between heaven and earth, so it is called "the heart of heaven and earth". This is an affirmation of man's position in the universe and a high degree of consciousness of man's subjectivity. There is no "heart" in heaven and earth, and people have "hearts". Because "man" is the heart of heaven and earth, "human heart" embodies "the heart of heaven and earth".