《论衡·卷二十五·解除篇》
既然鬼神的形状不能知晓，鬼神的想法也就不可推测。鬼神停留在人的住宅中，是想干什么呢？
形既不可知，心亦不可图，鬼神集止人宅，欲何求乎？
Since the shape of ghosts and spirits cannot be known, the thoughts of ghosts and spirits cannot be guessed. When ghosts and spirits stay in people's homes, what do they want to do?