《旧五代史·后周·世宗纪二》
如果朕有过失，可以尽量进言；时政有弊病，不应有隐瞒。
若朕躬之有阙失，得以尽言；时政之有瑕疵，勿宜有隐。
If I have made mistakes, please feel free to point them out; if there are any flaws in the current policies, they should not be concealed.