《史记·三十世家·孔子世家》
上朝时，与上大夫交谈，态度和悦，中正自然；与下大夫交谈，就显得和乐安详了了。
朝，与上大夫言，訚訚如也；与下大夫言，侃侃如也。
When he attended court, he was pleasant and straightforward when conversing with high-ranking officials; when conversing with low-ranking officials, he seemed more relaxed and approachable.