He had a debate on San-ichi Gonjitsu (One-provisional and three-true teaching vehicles) with Tokuitsu AIZU, a Buddhist scholar of Hosso School (the Dharma Characteristics School).
法相宗（ほっそうしゅう）の学僧会津徳一（とくいつ）との間に、三一権実（さんいちごんじつ）の論争。