What is Yan Zhenqing praised by later generations?

Yan Zhenqing (A.D. 709-785), a native of Xiaolangdi (now Zhu cman Village, Fangcheng, Feixian County, Shandong Province), was an outstanding calligrapher, politician and strategist in the Tang Dynasty. He is an official of the four emperors, an official of the official department, and a prince. He once joined hands with his younger brother Yan Gaoqing to fight the Anshi rebellion and made great contributions. Killed by rebel Li Xilie, he died heroically. During his lifetime, he was named "Duke of Founding Lu County" because of his merits, and later he was named "Situ", "posthumous title Wenzhong" and "Yan" in the world. He is another great calligrapher after Wang Xizhi, the "book saint", the creator of the new book style "Yan Ti" in Tang Dynasty, and is praised as "elegant saint" by later generations. In the history of calligraphy, "Yan Ti" created a unique realm of calligraphy. Su Shi once said, "Poetry ends in Du Zimei, and books end in Duke Lu". "Point like falling rocks, painting like Xia Yun, hook like qu Jin, lattice like crossbow, vertical and horizontal imagery, low-key posture, strong brushwork, calm and dignified" is his unique style of calligraphy. There are more than 200 kinds of ink marks, which are still widely circulated after thousands of years of vicissitudes. His extensive and profound calligraphy art has a far-reaching influence on later generations, and he has been admired by China people and Sinology friends at home and abroad for thousands of years. His ink has become a model sample for later generations to learn books and a brilliant treasure in the treasure house of China traditional culture.