He is said to have studied Hosso Sect, Sanron Sect and Esoteric Buddhism at Daian-ji Temple, but he is also said to have studied under the guidance of Gyoho, the mentor of Saicho who was the founder of the Nihon-Tendai Sect, and Soei of the Shingon Sect.
大安寺で法相宗・三論宗・密教を学び、また日本天台宗の祖最澄の師行表や、真言宗の宗叡に師事したともいう。