《论衡·卷六·福虚篇》
我认为，这是假话，因为看见两个头的蛇就会死，这是老百姓说的；暗中有德行的人，天会报答他福禄，这是老百姓的议论。
曰：此虚言矣。夫见两头蛇辄死者，俗言也；有阴德天报之福者，俗议也。
I believe that this is a lie, because it is said that seeing a two-headed snake will result in death; those who do good deeds in secret will be rewarded with blessings by Heaven, this is what the common people say.