《论衡·卷三·奇怪篇》
尧与汉高祖果真是龙的儿子，儿子的禀赋像父亲，龙能乘云，尧与高祖也应该能乘云。
尧、高祖审龙之子，子性类父，龙能乘云，尧与高祖亦宜能焉。
Yao and Han Gaozu are indeed sons of the dragon. The nature of a son is inherited from his father. A dragon can ride on the clouds. Therefore, Yao and Gaozu should be able to ride on the clouds.