《宋史·列传·卷一百九十八》
凡事要在得体，贵在得中，若今之可以议古，恐来者也会非今。
深惟事贵得中，用资体要，若今之可以议古，恐来者亦能非今。
Everything should be appropriate, the most important thing is to be moderate, if today we can criticize the past, I'm afraid that people in the future will also criticize us.