《资治通鉴·汉纪·汉纪五十五》
既成为天子的臣属，便遵奉天子的命令，在大义上就不能再为将军效命了。
在君为君，则嵩守天子之命，义不得复为将军死也。
“Having become a minister to the Son of Heaven, I shall obey his orders and, in terms of great principles, I shall no longer be able to serve you, General.