《北史·列传·卷二十八》
孝文帝很高兴，因而对他说： 我期望你常以坚贞的青松激励自己的气节，在寒冷的冬天磨砺自己的意志，你应尽心尽力，报效国家。近日见到弹劾你的奏章，与我期望的相差甚远。
帝悦，因谓曰： 朕期卿每以贞松为志，岁寒为心，卿应报国，尽心为用，近见弹文，殊乖所以。
Emperor Xiaowen was very happy so said to him: I would like you to regard the hardy pine tree as an example for your integrity. In the cold winter, you should build up your determination and you should repay the state with all your heart and soul. Recently I saw a memorial impeaching you and this was very different to what I had expected.