《梦溪笔谈·人事一》
并且还说： 骏马已经老了，情愿让那些劣马跑到前面去；鳌龙已经不灵了，原来是有顽石压在身上。 
又云： 骐骥已老，甘弩马以先之；臣鳌不灵，因顽石之在上。 
Furthermore, he also said: The fast horse is old, and I'd rather allow the slow horses to run ahead; the giant fish is unable to rise high, and it is because of the heavy stone weighing on its body.