《鬼谷子·中经·全篇》
所以遇到忠贞信义的人，一定要称颂他的德行，鼓励他再接再厉。表示可以再度合作，后会有期，对方一定会很高兴。以他人之幸运，去引验他往日的光荣，即使款款而去，也必定十分留恋于我们。
故接贞信者，称其行、厉其志，言可为可复，会之期喜，以他人之庶，引验以结往，明款款而去之。
So when you meet a loyal and trustworthy person, it is very important to praise their virtuous actions and encourage them to continue striving. Expressing that you would like to work together again and that you will meet again in the future will definitely make them very happy. By emphasizing their good fortune and referring to their past glories, even if you leave on good terms, they will undoubtedly miss us very much.