Around 1247, when Shinran was about 75, he completed his work "Kyogyo shinsho", which Shinran had been revising and supplementing for a long time, and he allowed his disciple Sonren to copy his book.
寛元5年（1247年）75歳の頃には、補足･改訂を続けてきた『教行信証』を完成したとされ、尊蓮に書写を許す。