Zhang zai's. Zhang Zai, born in Chang 'an (now Xi 'an, Shaanxi Province) and Daliang, lived in Hengqu Town, Meixian County, Fengxiang County (now Hengqu Town, Meixian County, Shaanxi Province) and settled down to give lectures. He was called "Mr. Hengqu" by the world. One of the thinkers, educators and founders of Neo-Confucianism in the Northern Song Dynasty, his famous saying of "making a heart for heaven and earth, making a life for the people, connecting the past with the future, and opening up a peaceful and prosperous time" is called "four sentences in a horizontal canal". Because of its conciseness, it has been praised throughout the ages.