And in sermons contained in "the Nirvana Sutra," Buddha explained the four categories of teachings that he had already preached, once again for the masses who were not yet ready (or not enlightened enough) to attain religious salvation.
しかし、なお機根の熟していない（あるいは低い）衆生の為に、さらにこれらの四教を『涅槃経』で説いたとする。