《史记·七十列传·苏秦列传》
苏秦恐怕被杀，就劝说燕王： 我留在燕国，不能使燕国的地位提高，假如我在齐国，就一定能提高燕国的地位。 
苏秦恐诛，乃说燕王曰： 臣居燕不能使燕重，而在齐则燕必重。 
Su Qin was afraid of being killed, so he advised the king of Yan: If I remain in Yan, I will not be able to improve the state's position. But if I go to Qi, I will definitely be able to improve Yan's position.