《资治通鉴·宋纪·宋纪一》
太子拓跋焘聪明，胸襟开阔，文武百官有时就疑难问题请示拓跋嗣，拓跋嗣就说： 这个我不知道，去让你们的国主决定吧！ 
太子聪明，有大度。群臣时奏所疑，帝曰： 此非我所知，当决之汝曹国主也。 
Crown Prince Tuoba Tao was intelligent and open-minded. When the civil and military officials had questions, they sometimes asked Tuoba Si for instructions. Tuoba Si would then say: “I don’t know about this, go ask your emperor to make the decision!”