《论衡·卷十九·恢国篇》
对经书反复熟读，才能发现其中精微的道理；对一个朝代越是充分论述，它的杰出之处就越显著。
夫经熟讲者，要妙乃见；国极论者，恢奇弥出。
Only by repeatedly reading the classics can we discover the subtle principles in them; the more we discuss a dynasty, the more its outstanding achievements will become apparent.