《资治通鉴·汉纪·汉纪五十八》
当时年纪还不大，就在谯县县城以东五十里处修建书房，打算秋季与夏季读书，冬季与春季射猎，计划这样过二十年，等天下安定以后，再出来做官。
时年纪尚少，乃于谯东五十里筑精舍，欲秋夏读书，冬春射猎，为二十年规，待天下清乃出仕耳。
At that time, I was still young, so I built a library 50 miles east of the county town of Qiao, and intended to study in autumn and summer as well as hunt in winter and spring. I planned to do that for 20 years, and wait until the world was stable before going out to be an official.