《宋史·列传·卷一百七十五》
冉氏兄弟二人成天不说话，仅仅相对而坐，用白垩在地上画成山丘、河流、城邑、护城河之类的形状，站起来时就把画的图形擦去。这样又过了上十天，要求进见余玠，屏退了左右的人，于是说： 我们兄弟有辱贤明之公您的礼遇之恩，思量只有不多的裨益好处，不敢同其他众人一样。
兄弟终日不言，惟对踞，以垩画地为山川城池之形，起则漫去，如是又旬日，请见玠，屏人曰： 某兄弟辱明公礼遇，思有以少裨益，非敢同众人也。
The Ran brothers didn't speak all day long, they just sat opposite each other, drawing mountains, rivers, cities, and moats on the ground with chalk, and erased the drawings when they stood up. After another ten days or so, I asked to see Yu Jie, dismissed all the people around him, and said: "We, the brothers, have humiliated your kindness and kindness, and we can only think of some small benefits. We dare not be like other people."