In masse, the period after Sakya-muni Buddha's death, bad Biku (Buddhist priests) may become rampant, break religious precepts, and mislead people saying that 'Nyorai (Tathagata) is impermanent,' so to prevent it, "Nehan-gyo" preaches the demand of the precepts and eternity of bussho.
釈迦仏の入滅後の末世において、悪比丘が横行し戒律を破り、「如来は無常なり」などという誤解を生じさせんがために、戒律の必要性を説き仏性の常住を説いたのが『涅槃経』であるという。