《太平广记·卷八·神仙八》
要长期的学习道术，清净无为才能养性，真心修道的人必须刻苦勤奋，任凭那些愚昧的人去笑话吧，只要能得到仙丹灵药，就可以永不衰老，长得安康。 
积学所致，无为合神，上士为之，勉力加勤，下愚大笑，以为不然，能知神丹。久视长安。 
To learn Taoism for a long time, only by doing nothing can one cultivate one's nature, and those who truly cultivate the Tao must work hard and diligently, regardless of what those ignorant people laugh at, as long as they can obtain the elixir of immortality, they can live forever without getting old or sick.