The Tannishō (歎異抄), also known as the Lamentations of Divergences, is a late 13th century short Buddhist text generally thought to have been written by Yuien, a disciple of Shinran.
In the Tannishō, Yuien is concerned about the rising doctrinal divergences that emerged in Jōdo Shinshū Buddhism after the death of their founder, so he wrote down dialogues between himself and Shinran that he could recall when his master was alive.
The Tannishō was also a major impetus for the start of The Dobokai Movement[2] among the Higashi Hongwanji branch of Jōdo Shinshū.
Further, an appendix discusses the history of the exile Shinran and other disciples of the Pure Land movement, including his teacher Honen, from the capitol during the reign of Emperor Gotoba.
Finally, a postscript, composed by Rennyo states that:[1] 右斯聖教者為当流大事聖教也 於無宿善機無左右不可許之者也 This sacred scripture is one of the most valuable texts of our school.