Most people who read "Journey to the West" have heard two words: monsters with background are taken away, monsters without background are killed. These are two well-known hidden rules in Journey to the West. But in addition to these two, there is a hidden rule, which is also important.
It is said that Sun Wukong encountered Qing Niu Jing on the way to learn the scriptures. This monster has a Vajrayana, which is very powerful. Sun Wukong asked many rescuers but failed to defeat him.
No way, Sun Wukong had to go to Lingshan to find Rugao Buddha. Rulai Buddha said: "Although I know the monster, I ca n’t tell you. You monkey is open-mouthed. As soon as the preacher tells me he will not fight with you, he will fight against Lingshan, and it will cause me evil. I'm here to help you catch him. "