《吕氏春秋·览·孝行览》
楚王想夺取息国和蔡国，于是就假装跟蔡侯友好，并且与他商量说： 我想得到息国，该怎么办? 
楚王欲取息与蔡，乃先佯善蔡侯，而与之谋曰： 吾欲得息，柰何？ 
The King of Chu wanted to seize the State of Xi and State of Cai, then pretended to be friendly with the Lord of Cai, and discussed with him: I want to get the State of Xi, what should I do?