Nourishing the Pearl

From the Zhouyi cantong qi 周易參同契 (The Seal of the Unity of the Three), the earliest and the most important Taoist treatise on inner Alchemy, attributed to the master Wei Boyang.

Innerly nourish yourself,
serene and quiescent in Empty Non-Being.
Going back to the fundament conceal your light,
and innerly illuminate your body.

"Shut the openings"
and raise and strengthen the Numinous Trunk;
as the three luminaries sink into the ground,
warmly nourish the Pearl.

"Watching, you do not see it" -
it is nearby and easy to seek.