佛祖統紀 38.35

38.35

十九年。帝幸徐州白塔寺。令道登法師講成實論。謂左右曰。朕每覽此論可以釋人深情（僧史略云。此論最多法相。羅什刪略以授嵩師。嵩授淵。淵授登。此解論之始）○京兆王太子興久病。祈佛獲愈。願舍王爵求出家。表十上乃許。賜名僧懿。勅皇太子以四月八日為落髮于嵩岳寺。

In the nineteenth year, the emperor visited the Baita Monastery in Xuzhou and ordered Dharma Master Daodeng to lecture on the Tattvasiddhi Śāstra. He said to his attendants, 'Whenever We examine this treatise, it can resolve one's deepest emotions' (The Brief History of the Clergy says: This treatise has the most dharmalakṣaṇas. Kumārajīva abridged it and transmitted it to Master Song; Song transmitted it to Yuan; Yuan transmitted it to Deng; this was the beginning of explaining the treatise). Prince Xing, heir to the Prince of Jingzhao, had been ill for a long time; he prayed to the Buddha and obtained healing. He vowed to renounce his royal nobility and sought to leave household life. Only after submitting ten memorials was he permitted to do so. He was bestowed the name Sengyi, and the emperor decreed that the Crown Prince shave his head on the eighth day of the fourth month at the Songyue Monastery.