In Gan Qing Palace, the first hall of the three palaces of the Forbidden City, there is a four-character plaque written by the emperor shunzhi. the emperor shunzhi was the first emperor who lived in the Forbidden City after the Qing army entered the Central Plains and established the Manchu regime.
Later, Emperor Kangxi carved words and stones on this plaque. The words "fair and bright" on the plaque are from the Book of Changes. "The great is strong and fair, the love between heaven and earth is visible, justice and integrity, and the throne is innocent and bright."
It means telling emperors that if they want to stabilize their imperial power, they must follow the example of heaven and earth and conform to human feelings, thus showing that their rulers are aboveboard.
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At that time, the infighting among governors for the throne was quite fierce. In order to alleviate this contradiction, since the Yongzheng dynasty, the secret storage method has been adopted, that is, the emperor unfairly disclosed the documents of the selected heir to the throne in two copies, one for the emperor; One of them was sealed in the "building storage box" and placed behind the "fairness and justice" plaque.
After the emperor died, Minister Gu Ming took down the "storage box" and compared it with the copy kept by the emperor. After verification, he announced the heir to the throne. Qianlong, Jiaqing, Daoguang and Xianfeng all ascended the throne according to this system. By the end of the Qing Dynasty, because Emperor Xianfeng had only one son, Tongzhi and Emperor Guangxu had no sons, this way of hiding lost its meaning.
Baidu Encyclopedia-aboveboard