《资治通鉴·周纪·周纪三》
郭隗说： 古时候有一位君王派涓人带着千斤黄金求购千里马，找到一匹千里马却已经死了，就花了五百斤黄金把马头买回去。
郭隗曰： 古之人君有以千金使涓人求千里马者，马已死，买其首五百金而返。
Guo Wei said: In ancient times, there was a monarch who sent a buyer with a thousand kilograms of gold to buy a thousand-mile horse. When he found a horse that could run thousands of miles but was already dead, he spent 500 kilograms of gold to buy the horse's head.