《资治通鉴·唐纪·唐纪七》
我打算将你立为继承人，你却坚决推辞掉了。而且，建成年纪最大，作为继承人，为时已久，我也不忍心削去他的权力啊。
吾欲立汝为嗣，汝固辞；且建成年长，为嗣日久，吾不忍夺也。
"I planned to make you the heir, but you firmly declined. Moreover, Jiancheng is the oldest, and it has been a long time since he became the heir. I can't bear to take away his power. "