《论衡·卷三·偶会篇》
并非是舜、禹该得天下而使丹朱、商均二人作恶，其实美恶是非是正好相互碰在一起的。
非舜、禹当得天下，能使二子恶也；美恶是非适相逢也。
It was not that Shun and Yu were supposed to rule and caused Danzhu and Shang Jun to commit evil, but rather that good and evil and right and wrong happened to coincide.