Within the depth-psychology and sinological corpus represented in this library, yinyang functions not as a static philosophical dyad but as a living cosmological grammar that organizes the entire interpretive field of the I Ching and allied Taoist traditions. The corpus reveals several distinct registers of engagement. In the I Ching commentarial tradition — from Richard Wilhelm and Hellmut Wilhelm through Liu I-ming, Alfred Huang, and Wang Bi — yinyang constitutes the irreducible polarity underlying hexagrammatic structure: the fixed, daemonic world of yin contrasted with the mutable, light-filled realm of yang, whose secret is perpetual motion without stasis. Liu I-ming's Taoist alchemical reading sharpens this further: yin and yang are not merely cosmological categories but psycho-spiritual forces whose inner refinement — expelling the 'human mentality' as yin, cultivating the 'mind of Tao' as yang — is the very substance of neidan practice. A notable tension runs throughout: whether yinyang designates an ontological complementarity tending toward harmony (Huang's 'positive complement') or a dynamic contest in which one force must be actively managed to prevent the other's destructive dominance. Hellmut Wilhelm emphasizes the mythological depth beneath the abstraction — mares, dragons, phoenix — while the Taoist alchemical strand (Cleary/Liu I-ming) radically internalizes the polarity. Jung's corpus, though not engaging yinyang by name in the retrieved passages, furnishes the psychological analogue through the conscious-unconscious tension that the library consistently reads as structurally homologous to this Chinese dyad.
The entire I Ching is concerned with the relationship between yin and yang... When yin competes against yang, it reveals the yin aspect; then yin represents evil instead of yielding.
Huang argues that the I Ching's governing concern is the yin-yang relationship, insisting that yin's proper mode is yielding complementarity, while competitive yin becomes a destructive, evil force.
, The Complete I Ching: The Definitive Translation, 1998thesis
This world of the immutable is the daemonic world, in which there is no free choice, in which everything is fixed. It is the world of yin. But in addition to this rigid world of number, there are living trends... the realm of yang.
Wilhelm maps yin onto the fixed, daemonic world of necessity and yang onto the mutable world of living change, establishing the cosmological polarity as the structural foundation of the Book of Changes.
, The I Ching or Book of Changes, 1950thesis
In their alternation and reciprocal effect, the two fundamental forces serve to explain all the phenomena in the world. Nonetheless, there remains something that cannot be explained in terms of the interaction of these forces, a final why.
Wilhelm asserts that while the alternation of yin and yang explains all worldly phenomena, Tao ultimately surpasses their interaction as an unfathomable spirit beyond the dyad.
, The I Ching or Book of Changes, 1950thesis
As yin dwells in the midst of yang, not losing correctness regardless of accord or opposition is the middling grade of yield. When the three grades of great medicine... return to the center, yin and yang merge, the gold elixir takes on form.
Cleary and Liu I-ming present yinyang merging as the telos of alchemical practice, in which the interpenetration of the two forces at the center produces the gold elixir — the consummation of inner cultivation.
, The Taoist I Ching, 1986thesis
He composed the Triplex Unity... so as to elucidate the source of essence and life, the reality and falsehood of yin and yang, the laws of cultivation and practice, the order of work.
The Taoist alchemical tradition, traced to Wei Po-yang's Triplex Unity, is characterized as centrally concerned with discriminating the 'reality and falsehood of yin and yang' as a discipline of self-cultivation.
, The Taoist I Ching, 1986thesis
When the three grades of great medicine, superior, middling, and inferior, return to the center, yin and yang merge, the gold elixir takes on form; this is purely the living potential.
Liu I-ming describes the merging of yin and yang at the alchemical center as the moment of pure living potential — the realization of the gold elixir through inner work.
, The Taoist I Ching, 1986supporting
In the human body, the vitality, spirit, soul, psyche, and intent all belong to yin and all take orders from the human mentality.
Liu I-ming maps yinyang onto the structure of inner life, classifying all the body's spiritual faculties as yin forces subordinate to the human mind, whose refinement is the work of self-cultivation.
, The Taoist I Ching, 1986supporting
These animals are indeed only symbols for the polar tension between the sexes originating in the fundamental antithesis of cosmic forces. Later in the Book of Changes this polar tension finds a more abstract expression.
Hellmut Wilhelm traces the mythological imagery of dragon and mare, phoenix and cow, as symbolic expressions of cosmic yinyang polarity that is later abstracted into the conceptual language of the I Ching.
, Change: Eight Lectures on the I Ching, 1960supporting
Now yin, now yang, that is tao; what makes it continue is goodness, what completes it is nature.
Hellmut Wilhelm cites the Sung philosophical formulation in which the alternation of yin and yang constitutes Tao itself, with goodness as its continuance and nature as its completion.
, Change: Eight Lectures on the I Ching, 1960supporting
When yang culminates, it must shift to yin. The celestial jewel gained is again lost. It is a logical matter of course.
Cleary articulates the cyclical law of yinyang transformation — that culminating yang necessarily shifts to yin — as a logical imperative governing the timing of all action.
, The Taoist I Ching, 1986supporting
With one yang dwelling in the midst of a group of yins, not confused by the yins, it can also convert the yins, so that all come and follow it.
Liu I-ming describes the transformative power of yang within a field of yin forces, using the hexagrammatic image to articulate the alchemical principle that a single yang can convert surrounding yin.
, The Taoist I Ching, 1986supporting
One good can dissolve a hundred evils, and one can immediately climb up on the shore of the Tao. This is ability to not obstruct yang when it arises.
Cleary frames moral and spiritual progress in terms of not obstructing the arising of yang, identifying the cultivation of yang energy with the dissolution of evil and return to Tao.
, The Taoist I Ching, 1986supporting
One must have flexibility within firmness, and firmness within flexibility, parting gradually, advancing a portion of celestial energy, repelling a portion of mundanity, so that celestial energy advances to wholeness.
Liu I-ming articulates the practical ethics of yinyang balance — firmness within flexibility and vice versa — as the gradualist method by which celestial (yang) energy displaces mundane (yin) energy in practice.
, The Taoist I Ching, 1986supporting
Creation, development, fruition, consummation, the successive movements of the four seasons, all are carried out by one strength; the one is the body, the four are the function.
Liu I-ming implicitly frames yang's movement through the four seasons as the single cosmological force whose fourfold expression enacts the creative cycle underlying the yinyang schema.
, The Taoist I Ching, 1986aside