《资治通鉴·魏纪·魏纪四》
如果公孙渊改变主意，打算自动向魏表明忠心，我们的两位使节不能返回，不也让天下人取笑吗？ 
若渊改图，欲自明于魏，两使不反，不亦取笑于天下乎！ 
If Gongsun Yuan changes his mind, decides to swear allegiance to Wei, and our two envoys cannot return, wouldn't people around the world laugh at us? 