In the winter of 587 BC, Sakyamuni told his disciples in a statement that Nirvana would be available in three months. Three months later, Sakyamuni was lying under the tree under the tree, with its head and shoulders to the north and its feet to the south and facing the west. Its silence facing back to the east was Nirvana. You see, this time, Sakyamuni binocular eyes closed, lips smile, quiet look, without any pain and sadness before his death. He was calm and confident, happy to enter the realm of happiness.