《旧唐书·列传·卷十七》
李靖生性沉稳厚重，平时与大臣一起参议国事时，总是蠕动着嘴唇，像是不会说话一样。
靖性沉厚，每与时宰参议，恂恂然似不能言。
Li Jing was naturally calm and composed. Whenever he discussed state affairs with the ministers, he would always move his lips, as if he were unable to speak.