夫鉛汞者，天地之始，萬物之母，金丹之本也。
“Lead and mercury:
The creation of heaven and earth,
The mother of all beings,
The origin of golden elixir.”- Li Daochun, classic of the middle harmony.
真鉛真汞身心是也。
“Real lead and real mercury are the body and mind.” – Li Daochun.