《贞观政要·卷四·太子诸王定分》
从前魏武帝曹操宠爱陈思王曹植，到文帝曹丕即位后，对陈思王监视禁闭，把他当成监狱里的囚犯，这是由于先皇加恩太多，继位的君主加倍提防他的缘故。
昔魏武帝宠树陈思，及文帝即位，防守禁闭，有同狱囚，以先帝加恩太多，故嗣王从而畏之也。
In ancient times, when Emperor Wu of Wei, Cao Cao, favored the Prince of Chensi, Cao Zhi, the Emperor Wen, Cao Pi, imprisoned the Prince of Chensi after he succeeded to the throne, and treated him like a criminal in prison. This is because the former emperor bestowed too much grace upon him, and the succeeding emperor was doubly wary of him.