Personally, I think the whole sentence should mean self-monitoring and self-monitoring. Hehe, not necessarily right.
In 206 BC, Liu Bang invaded Xianyang and opened the treasury of the Qin Dynasty. When he saw all the gold and silver treasures, he was overjoyed and hurriedly ordered: "All of them will be moved to my house!" " A man walked up to him-Xiao He, patted him on the shoulder and said, "Slow down! Your majesty! Won the world, these treasures are not all yours? ! You can't take it yet! It's amazing to hear that Qin Shihuang has The A Qin Classic. Look at a person and you will know whether he is good or bad, loyal or treacherous. I wonder if he is in the treasure house? "
Don't tell me, Liu Bang really found this magic mirror. After coming to Hanzhong to be Hanwang, Liu Bang hung the mirror high above his desk. What do you mean? Just don't be stupid enough to take pictures one by one, let the minister of civil and military affairs have a look for himself and play a deterrent role.
On this day, Liu Bang went to work early in the morning, pushed open the office door and saw himself in the mirror as a "dirty heart". In a rage, he threw Qin Jing out, only to find that Qin Jing was buried in a clear pool. Without Qin Jing, Liu Bang wrote "Qin Jing Hanging High" in the original position, which is even worse. Don't take another photo by yourself. Maybe one day I will secretly take a picture of you, which is more deterrent.
Since then, ministers have erected a plaque "Qin Jing hangs high" in court. Later, in order to flaunt their honesty, fairness and strictness, "Qin Jing hangs high" gradually evolved into a more popular "mirror hangs high". Since it is said that Qin Jing has magical functions, it has become a "magic mirror" on the beam of ordinary people since it was introduced to people.
As the saying goes:
The pond is like a mirror. If it shines today, it's my fault. Mo Xiaoping's whereabouts are uncertain, so is the spring breeze. (See Miscellanies of Xijing)