The meaning of Wen Zhonggong's sentence is: once the country is in trouble, the imperial clan governors can not only save the nation from extinction, but also inherit the country; However, if the influence of the imperial clan governors is growing, it will greatly weaken the authority of the emperor and may not be able to protect the imperial clan from being usurped ... the county system can prevent the centralization of the emperor from being threatened; However, the decline of the royal family and the decline of the imperial clan can only protect the country for a long time ... These two methods are like the complementarity of simplicity and literature, and you can't tell which is good or bad ... You mainly arranged various systems reasonably according to the specific situation at that time, so that they all reflected the positive side as far as possible and prevented from slipping into the negative side. ...