In the period when Chigi was active and Tendai-shu sect prospered, the Nehan Sect that has its basis on Nehan-gyo became only a school sect and was impractical.
智顗が活躍し天台宗が興隆した当時は、涅槃経を所依とする涅槃宗は単なる学派となり実践力が薄れていた。