In 830, he wrote "Himitsu Mandala Jujushinron" (Ten Abiding Stages on the Secret Mandalas) of ten volumes and "Hizohoyaku" of three volumes, corresponding to an Imperial order from Emperor Junna.
天長7年（830年）、淳和天皇の勅に答え『秘密曼荼羅十住心論』十巻、『秘蔵宝鑰』三巻を著した。