《韩非子·内储说下六微》
大成牛从赵国对在韩国的申不富说： 您用韩国的力量使我得到赵国的重用，我再用赵国的力量使您得到韩国的重用，这样一来，就像您有两个韩国，我有两个赵国一样了 。
大成牛从赵谓申不害于韩曰： 以韩重我于赵，请以赵重子于韩，是子有两韩，我有两赵。 
Dacheng Niu said to Shen Buhu, who was in South Korea, from Zhao: You used the power of South Korea to help me gain a high position in Zhao, and I will use the power of Zhao to help you gain a high position in South Korea. In this way, it is like you have two South Koreas, and I have two Zhaos.