A letter written by the Zen monk Daxiu Zhengnian (1215-89). In 1269, he came to Japan at the invitation of Hojo Tokimune(1251-84), the eighth regent of the Kamakura shogunate, and after entering Zenkoji Temple in Kamakura, he became the abbot of Kenchoji Temple. He subsequently held positions at Jufukuji Temple and Engakuji Temple, before founding Jochiji Temple. This letter was addressed to his friend, and is thought to have been written in his later years, when Daxiu was revealing his thoughts as he grew older, as he quotes a famous phrase from the Diamond Sutra to talk about the impermanence of all things, and mentions his own impaired eyesight. The letter is 14 lines in total.

Publications
*Birankan, Tokiwayama Bunko, 1954 (see commentary by Honan Tayama)
*Hibai Yoko – Selected Catalogue from the Tokiwayama Bunko, The Tokiwayama Foundation, 1967 (see commentary by Hisao Sugahara)
*Treasures of Tokiwayama Bunko Foundation – Selected Masterpieces: Calligraphy and Ink Paintings, Tokiwayama Bunko Foundation,2003 (see commentary by Noriko Takahashi)
*Selected Masterpieces from the Treasures of Tokiwayama Bunko Foundation – Commemorating the 80th Anniversary of Tokiwayama Bunko Foundation, Tokiwayama Bunko Foundation,2023 (see commentary by Chizuko Emi)