In 1901, he introduced an objective methodology into the accomplishments of Buddhist thought research to which he had been dedicated for a long time, and wrote "Bukkyo Toitsu Ron" (On the Unification of Buddhism) to advocate the thesis that the Mahayana teachings do not stem from the historical Buddha, which produced much controversy.
また、1901年、永年の仏教思想研究の成果に客観的方法論を導入して『仏教統一論』を著し、大乗非仏説を提起、大きな反響を呼んだ。