Inner Alchemy (Neidan): Returning Shen to the Void (煉神還虛)

Liàn Shén Huán Xū (煉神還虛) is the third transmutation of Neidan: individual spirit (shen) dissolves back into primordial emptiness (xū). The spiritual embryo, fully matured in the upper dantian (niwán), is released through the crown — what the Wuzhen Pian calls 'the infant leaving the womb.' At this stage the practitioner ceases to maintain a boundary between inner awareness and the formless ground of the Dao. The Dao De Jing (Chapter 16) instructs: 'Attain the utmost emptiness; hold firm to stillness' — this is both the method and the destination of the third refinement, where the distinction between practitioner and practice collapses.