《太平广记·卷四十二·神仙四十二》
他有时露宿在坛中，有时睡在草间树下。人们窥视他，只见云气蓊郁，不见他的身体。
或露宿坛中，草间树下，人窥觇之，但见云气蓊欝，不见其身。
Sometimes he rested overnight in an altar, sometimes he slept beneath trees in the grass. The people who spied on him only saw cloudy vapours and were unable to make out his physical form.