Zhang Jizhi's "Vajra Prajnaparamita Sutra" (detail) on paper, regular script, 32.3 cm vertical, collected by Chisokuin Institute, Kyoto, Japan

  "Vajra Prajnaparamita Sutra" was written by Zhang Jizhi in the first year of Baoyou (1153). Zhang Jizhi's regular calligraphy is outstanding in the Southern Song Dynasty. This Zhang Jizhi's handwritten "Vajra Prajna Paramita Sutra" is a masterpiece of his calligraphy in his later years. The writing is simple and concise, the strokes are firm and strong, and the dots are thoughtful and emotional; the characters are handsome and strong, making the characters vivid and lively, refreshing and unconventional. Paying great attention to the changes in the strokes of each character, the thickness, expansion and contraction of the strokes are all done randomly, but without losing control. It is a unique calligraphy. Therefore, this calligraphy has a strong artistic appeal and is a masterpiece of regular script of the generation.