Liu Bowen entered Zhuge Liang's tomb and kowtowed with fear. What's the secret in it?

Later, people said that Liu Bowen refused to accept the Ming Dynasty and wanted to see if Zhuge Liang had any treasures, so he dug Zhuge Liang's grave and opened it. Later, he found that there were seven vats, and the wick was finally connected with a lamp, all for an ever-burning lamp. He found that six of the seven tanks were empty and the last one was empty. There is not much oil left, so Liu Bowen thinks that if you leave any secrets or treasures around here, I must look for them, and I have found nothing. I finally dug up a small piece of bamboo slips with eight words written on it. Liu Xiaoliu quickly added oil, meaning that Zhuge Liang came out before he died.