He discovered the answer to the problem of integrating the Lotus Sutra and Esoteric Buddhism, known as the 'Thirty Unsolved Issues,' and copied 37 volumes of Buddhist scriptures stored at Mt. Wutai that had not yet been introduced to Japan.
法華経と密教の整合性に関する未解決の問題など「未決三十条」の解答を得、日本にまだ伝来していなかった五台山所蔵の仏典37巻を書写する。