Yi Kun: "Huang Shang Yuanji." Confucius' Ying Da Shu: "Yuan is big."

Selected Works Zhang Heng: "God sincerely cares about morality, while the spirit is dominated by Yuanji." Xue Zong's note: "Yuan, big also; Ji, Dao. "

Yan Zhitui's "Yan Family Instructions" in the Northern Qi Dynasty: "The injury caused by gravel is not as good as the spear halberd; The disaster of irony is as fast as dust; It is advisable to plan ahead and protect Yuanji. "

Yan Zhitui was a famous thinker, educator, poet and writer in the Southern and Northern Dynasties. In particular, Family Instructions for Yan (20 articles in total) is a summary of his life's experience in establishing a person, living and studying, and it is a systematic family education textbook.