Knowing about "unknown life, how to know death", and "failed to treat people, how to treat spirits", "sacrificial ceremonies" are just reminding the descendants that to remember their ancestors. Unfortunately, there were lots of consumption in the sacrificial ceremonies. Therefore, Wang Chong recognized that, people die won't be a ghost, know-nothing, and unable to hurt human life. Ghost, is inexistence. Contrary, Wang Chong is certain that, the "yao妖" is existing. It makes people hurt, and, die.
