《文心雕龙·比兴》
这类例子虽多，总以十分切合为佳。如果把天鹅刻划成家鸭，那就没有什么可取的了。总结：
故比类虽繁，以切至为贵，若刻鹄类鹜，则无所取焉。
Although there are many such examples, it is always best to be very appropriate. If a swan is drawn as a duck, it will be worthless. Summary: