A sincere and ignorant person will betray his relatives and friends if he doesn't know when to say anything and when to do something. Such people should learn the skills of being a man, so as not to be used by others, and do things that hurt relatives and make enemies quick. A serious and stupid person will drive others crazy with poor persistence. For example, such people don't know when to stop their curiosity, and persistent exploration eventually makes curiosity hurt themselves and each other.

Therefore, contact with such people is very dangerous. Unless you are very experienced, you will fall into invisible danger.

When you are a sincere and ignorant, serious and stupid person, you are in danger, because your ignorance and stupidity will harm yourself and others.

Therefore, in order to prevent the tragedy from happening, the solution is to make yourself wise and less ignorant and stupid.