《资治通鉴·唐纪·唐纪十四》
太宗认为他出言妄自发论，颇为奇怪，告诫他说： 你的性情疏阔又刚直，必会因此而遭祸，应当慎重行事。 
上以其言妄发，颇怪之，戒曰： 卿性疏而太健，必以此败，深宜慎之！ 
Taizong found his brazen words rather strange, and warned him: “You are recklessly bold and blunt, and will certainly bring disaster upon yourself. You should act cautiously”.