《旧唐书·列传·卷十六》
前东宫太子李建成、海陵郡王李元吉，依靠恶人制造祸乱，陷害谋杀陛下，秦王府人人惶惶不安，处于累卵、倒悬似的危急时刻，生死存亡系于一旦，房玄龄的耿耿忠心，始终不曾改变。
而前宫、海陵，凭凶恃乱，干时事主，人不自安。居累卵之危，有倒悬之急，命视一刻，身縻寸景，玄龄之心，终始无变。
The former East Palace Crown Prince Li Jiancheng and the King of Ha陵郡, Li Yuanji, relied on villains to create chaos and framed and murdered Your Majesty. Everyone in the Prince of Qin's Palace was in a state of panic and was in a critical situation, as if on eggshells and hanging upside down, with life and death hanging in the balance. Fang Xuanling's unwavering loyalty never changed.