It is the time when the lights are on at three o'clock and the rooster is on the fifth o'clock. It is the time for men to study. Black hair does not know how to study diligently and early, and white hair regrets studying. Yan Zhenqing’s.
Yan Zhenqing (709-August 23, 784, named Qingchen, nicknamed Xianmenzi, nicknamed Yingfang, was born in Langya Linyi (today's Linyi City, Shandong Province[135])[134], Born in Jingzhao Wannian (now Xi'an City, Shaanxi Province [135]), he was a famous official and calligrapher in the Tang Dynasty. He was the grandson of the fifth generation of Secretary Yan Shigu and the younger brother of Situ Yan Gaoqing. He was born in the Tang Dynasty. In the 22nd year of Kaiyuan of Emperor Xuanzong (734), he ascended to the rank of Jinshi and served successively as the censor and censor. Later, he was demoted as the prefect of Pingyuan because he offended the powerful minister Yang Guozhong, and was known as "Yan Pingyuan" in the world. During the Anshi Rebellion, Yan Zhenqing led the rebel army to fight. The rebels once regained Hebei. Later he went to Fengxiang and was awarded the title of Shangshu of the Ministry of Civil Affairs and the Crown Prince. In the first year of Xingyuan (784), he was named Duke of Lu. , was sent to tell the rebel general Li Xilie, but he resisted the thieves sternly and was eventually hanged. After his death, the successor Cao King Li Gao and the soldiers of the three armies all cried bitterly for him and gave Situ the posthumous title "Wenzhong".