《史记·七十列传·张仪列传》
 所以我替大王策划，不如帮助秦国，秦国所希望的，没有比削弱楚国更重要的了，能够削弱楚国的国家中，没有谁比得上韩国。
 故为大王计，莫如为秦。秦之所欲莫如弱楚，而能弱楚者如韩。
So I planned for your Majesty, it is better to help the Qin state. What the Qin state hopes for is nothing more important than weakening the Chu state. Among the countries capable of weakening the Chu state, none can compare with Korea.