《旧唐书·列传·卷一百二十二》
接连叨蒙皇上恩惠，因而愧居中枢要职，为臣之子应举有碍体制，因此让他停止参加科举考试，自此中断应举，前后一十九年。
继叨渥泽，遂忝枢衡，事体有妨，因令罢举，自当废绝，一十九年。
Thanks to the repeated kindness of Your Majesty, I have the honour of holding an important central government post, which weighs heavily on my conscience because it prevents my son from entering for the imperial examinations; and so I have made him give up his studies for that purpose; the interruption has lasted for nineteen years.