《资治通鉴·宋纪·宋纪一》
而要成仙的人，靠吞服丹药，常加修炼以求飞腾升天，烧炼草木石以求变成黄金白银。
而为神仙者，服饵修炼以求轻举，炼草石为金银，其为术正相戾矣。
However, people who wanted to become immortals relied on taking alchemical pills. They often practiced cultivation to seek immortality and refined grass, wood, stone to get gold and silver.