Key points are not available for this paper at this time.
"Four sentences of Hengqu" include the ontology of Zhang Zai's philosophy, the theory of human nature and the academic pursuit and mission responsibility of Confucian scholars. Under the perspective of practical studies, "To set heart for Heaven and Earth; To secure life and fortune for the people" reflects that all things are born of Qi, from the perspective of Qi ontology shows that people can improve morality and become good by changing their temperament; "To inherit the ultimate truth for past sages; To establish peace for future generations" is intended to emphasize that everything are real and born in Qi, to clear and correct the name of Confucianism, follow this "right path" can realize the world peace.
Hourui Ya (Sun,) studied this question.