Liang Wudi Xiao Yan called his book "Twelve meanings, how wonderful these meanings are" (comments on the pros and cons of ancient and modern scholars).
Duane, written by Zhang Huaiguan in the Tang Dynasty, praised it as "a book with paternal style, slightly prepared bones and muscles, beautiful lines and grass, especially official calligraphy." I am floating in the air, and I have the ambition of lingyun. "