"Zhao Lun": The Hinayana of "Destroying wisdom with ashes, giving away worries" is Nirvana because it is more than Nirvana;
The Doctrine of the Mean and others regard "the reality of all laws" as nirvana for endless nirvana.
The Shurangama Sutra says: Because "all beings are fearless of their own nature"; It is convenient to say that there is a Tathagata hiding, in order to "lead me out." All beings are fascinated to hide, and there is no limit to their suffering; If you realize that the Tathagata is hidden, you will get nirvana, and all the pure merits and virtues you live in will be fully revealed.
In Agama, Sakyamuni, a disciple of the Buddha, returned to his hometown and entered nirvana. His disciples all mentioned Misha. After Dharma cremation, they went back to see the Buddha with relics-ashes, which was very sad. The Buddha asked him, "Bring it all up!" Your monk is gone, and so is his unswerving virtue and profound wisdom? No past. "Since life and death have gone, all the clean merits have not been lost, why cry?" This is as insightful as Mahayana Nirvana.