《资治通鉴·唐纪·唐纪八》
丁未，太宗带领各卫将士在显德殿庭院练习箭术，并当面训话道： 自古以来就有周边的戎狄等族的侵扰，值得忧虑的是边境稍微安宁，君主就放逸游荡，而忘记战争的威胁，因而一俟敌人来犯则难以抵御。
丁未，上引诸卫将卒习射于显德殿庭，谕之曰： 戎狄侵盗，自古有之，患在边境少安，则人主逸游忘战，是以寇来莫之能御。
Dingwei, Emperor Taizong led several guards to practice archery in the courtyard of Xiande Hall, and then personally gave a speech, saying, "Throughout history, there has always been trouble with the neighboring Rong Di ethnic groups. It's worrying that whenever the border is peaceful, the sovereign becomes comfortable and distracted, and then when the enemy does come, it is difficult to resist.