《吕氏春秋·论·不苟论》
得到中山国，不把它封给您的弟弟，却把它封给您的儿子，因此知道您不肖， 文侯听了很不高兴，脸色上表现了出来。
得中山不以封君之弟，而以封君之子，是以知君之不肖也。 文侯不说，知于颜色。任座趋而出。
You got the Zhongshan Kingdom but did not bestow it on your younger brother but instead bestowed it on your son, so we know that you are unworthy. Wenhou was very unhappy when he heard this, and it showed on his face.