《贞观政要·卷四·太子诸王定分》
并且要让他们及早明白自己的职责，断绝他们对太子位置的野心。这样，我死了之后，也能让他们兄弟之间没有危亡的祸患。 
且令其早有定分，绝觊觎之心，我百年后，使其兄弟无危亡之患也。 
And I must let them understand their own duties early on so as to cut off their ambitions for the position of Crown Prince. In this way, after I pass away, their brotherly relations will not be endangered.