Human death is like a lamp extinguished, reincarnation blows and rekindles, immortal death is like thoughts scattered, this life will never return, this is reincarnation. If a mortal wants to practice and become an immortal, he must go through many hardships and endure four or nine small tribulations before he can finally achieve enlightenment. However, no one knows what is at the end of the immortal road and no one has reached it.