A Study of Ryōzan’s 良算 <i>Gusō</i> 愚草: Another <i>rongishō</i> 論義抄 of the Japanese Hossō Sect

Abstract

The doctorinal development of the Japanese Hossō sect is based on rongishō (論義抄) which comprehensively investigate problems in the Cheng weishi lun (成唯識論). Ryōzan’s Jōyuishikiron dogakushō (成唯識論同学鈔) is particularly famous, but it has been pointed out that he compiled another rongishō named Gusō. Moreover he had a close relationship with his master Jōkei (貞慶, 1155–1213), who was the most influential monk of the Hossō sect. This is clear based on the fact that Rōzan’s Gusō was compiled with Jōkei’s permission. Thus, studies of Ryōzan’s Gusō are indispensable to elucidate the details of Yuishiki (Vijñaptimātra) doctrine in medieval Japan.