《后汉书·列传·郭符许列传》
常同去见郭林宗，总是夜以继日。郭林宗对门人说： 这两个人英才有余，但都不入道，可惜啊！ 
每共候林宗，未尝不连日达夜。林宗谓门人曰： 二子英才有余，而并不入道，惜乎！ 
Often met Guo Linzong together, and always worked day and night. Guo Linzong said to his apprentices: These two persons have more than enough talent, but they do not enter the path, what a pity!