《周书·列传·卷二十七》
宇文测性情深沉严谨，年少好学，常常卜天半月不看窗外。
测性沉密，少笃学，每旬月不窥户牖。
Yuwen Ce was deep and serious in nature, studied hard in his youth, and often spent more than half a month studying astronomy without looking out the window.