《北史·列传·卷四十六》
早先，宇文直心内忌恨宇文宪，宇文宪对他却宽容隐忍。况且，又认为他是武帝的同母兄弟，所以对他友好敬重。
初，直内忌宪，宪隐而容之，且以帝母弟，每加友敬。
Emperor Wu had previously held a grudge against Yuwen Xian, but Yuwen Xian had been tolerant and forgiving of him. In addition, he was the full brother of Emperor Wu, so treated him with kindness and respect.