2. Source:
(1) Biography of Boyi in Historical Records: "Although Yan Yuan was a scholar, he followed suit and made a difference."
(2) "Southern History, Scholars, Shen Dewei": "Although chaotic, I am tireless in learning."
(3) Stone Tombstone: "The young and the old are ignorant and generous."
(4) Ming Shaocan's "Lecture on the Fragrant Sack": "After three years of study, I am also strong."
(5) Biography of Chen Yuchuan in the Ming Dynasty: "Learn from the Expo and learn from the number of images."