《旧唐书·列传·卷一百一十六》
常常希望做到内容深刻语辞浅近，声韵严密格调新颖，律联对偶没有差误，而风采神态宛然若生，但是苦于未能做到啊。
常欲得思深语近，韵律调新，属对无差，而风情宛然，而病未能也。
He often hopes to achieve profound content with simple language, strict rhyme and tone patterns, and a novel style, with no errors in parallelism or antithesis, but with spirit and bearing that seem lifelike. However, he has not yet been able to do so.