《资治通鉴·唐纪·唐纪十四》
太宗认为萧当着大臣们讲话反复无常，心中愤愤不平；又赶上萧声称有脚病不上朝，或者到了朝堂而不进去面见太宗，太宗知道他心情不快。
上以瑀对群臣发言反覆，尤不能平；会称足疾不朝，或至朝堂而不入见。
Taizong thought that Xiao was very fickle in his words to the ministers, and was very resentful in his heart; besides, Xiao claimed that he was unable to go to court because of foot problems, or went to the court but did not go in to meet Taizong, and Taizong knew that he was in a bad mood.