《周书·列传·卷二十七》
宇文深回答道： 窦氏，是高欢的骁将，顽强凶猛而勇敢，作战急于求胜而轻敌，高欢每每依仗他，用他来抵御外侮。
对曰： 窦氏，欢之骁将也，顽凶而勇，战亟胜而轻敌，欢每仗之，以为御侮。
Yuwenshen replied: "The Dou clan were Gao Huan's fierce generals, who were fierce and brave. They were eager for victory and underestimated the enemy, and Gao Huan often relied on him to resist foreign invasions.