"By the time one reaches the state of Unlocking Gong (kaigong) and is enlightened, this dan will be a bomb that explodes and opens up all supernormal abilities, all locks in the body, and hundreds of energy passes. "Bang," everything will be shaken open. This is what the dan is used for. After a monk is cremated at death, sarira remain. Some people claim that those are bones and teeth. How come everyday people do not have sarira? Those are just the exploded dan, and their energy has been released. They contain in themselves a lot of substances from other dimensions. After all, they are also something of material existence, but of little use. People now take them to be something very precious. They contain energy, and are lustrous, as well as very hard. That is what they are."