《论衡·卷二十二·纪妖篇》
要说魂行如同狂风一样吗？那么它的速度不过是狂风一天的距离，也不能到达天上。
使魂行若飘风乎，则其速不过一日之行，亦不能至天。
Can it be said that the movement of the soul is like the strong wind? Then its speed is nothing more than the distance of a day's strong wind, and it cannot reach the heavens.