《论衡·卷七·道虚篇》
听说修道的吞服纯的金玉，吃紫灵芝的花，吃精美的东西身体会轻捷，所以能成神仙。
闻为道者，服金玉之精，食紫芝之英。食精身轻，故能神仙。
I heard that those who cultivate the Way swallow pure gold and jade, eat the flowers of lingzhi mushrooms, eat fine foods, and become light and agile, so they can become神仙.