There are four kinds of nirvana: nirvana, non-nirvana, sexual purity nirvana and non-dwelling nirvana. Yu Nirvana: He is ignorant and denies the cause of life and death in the afterlife, but the cause of this life is still there. Nirvana: Destroy the five aggregates and the eighteen realms, leaving nothing behind and being absolutely silent. This comes from sexual purity and nirvana: this is proved by the Bodhisattva from the inside. Its nature is silent. All laws are true, although there are guests, but their nature is pure, there are infinite subtle merits, no life is immortal, if empty, all beings are equal, different from all laws and different from all phases. Find a way, the famous saying is broken. Nirvana with nowhere to live: You don't live in Nirvana, you don't live in life and death, only the Buddha can prove it. If arhat doesn't grow up, he can only prove the first two, but not the second.