《后汉书·列传·独行列传》
这时兵戈连年，学业无人讲述了，谯玄独训诸子努力学习经书。
时，兵戈累年，莫能修尚学业，玄独训诸子勤习经书。
At this time there was war year after year, and no one was teaching academia, but Qiao Xuan personally taught his sons to study the Classics diligently.