《北史·列传·卷七十一》
江左声律激越，贵在清新绮丽；河朔词义耿直刚正，重在气韵质实。
江左宫商发越，贵于清绮；河朔词义贞刚，重乎气质。
South of the Yangzi, the rhythm was intense, and the emphasis was on freshness and beauty; north of the Yellow River, the words and meanings were straightforward and upright, and the emphasis was on the authentic quality of the breath and rhyme.