《资治通鉴·魏纪·魏纪九》
褚又禀告说： 尧、舜、周公之所以能使人忠心进谏，是因为他们诚恳真挚的心十分显著。
褚䂮复白曰： 尧、舜、周公所以能致忠谏者，以其款诚之心著也。
Chu then reported: The reason why Yao, Shun, and the Duke of Zhou were able to have people give them loyal advice is because their sincerity and honesty were very evident.