《汉书·志·郊祀志上》
陛下一定想要招他，就要提高使者的地位，让他做天子的亲信，并用客礼来招待他，不要鄙视他，让他们各自佩带着信印，才能使他们传话给神灵。
陛下必欲致之，则贵其使者，令为亲属，以客礼侍之，勿卑。使各佩其信印，乃可使通言于神人。
If Your Majesty wants to recruit him, you must elevate the envoy's status, treat him as a confidant of the Son of Heaven, and treat him with courtesy, not despising him. Only by making them carry their own letter seals can they pass on messages to the gods and spirits.