Chapter 6: Hexagram Guai of the Book of Changes and the Way of "Resolving" — The Firm-and-Yielding Philosophy Deep Within Guyu

Section 1: The Chen Month Matched with Guai — Guyu's Position Among the Twelve Sovereign Hexagrams

The Book of Changes (Zhouyi) is the encyclopedia of pre-Qin thought, containing within it the most profound insight into the laws governing the operation of the cosmos. Although the Book of Changes does not directly discuss the solar terms, its system of hexagrams bears a profound correspondence to the succession of the four seasons. To grasp Guyu's position within the Book of Changes, we must begin with "the twelve sovereign hexagrams" (shi'er xiaoxi gua).

The twelve sovereign hexagrams are twelve special hexagrams matched to the twelve months, displaying the complete process of yin and yang's waxing and waning across the year:

The eleventh month, hexagram Fu ䷗ (one yang line born); the twelfth month, hexagram Lin ䷒ (two yang lines growing); the first month, hexagram Tai ䷊ (three yang lines, "peace and prosperity"); the second month, hexagram Dazhuang ䷡ (four yang lines, "great strength"); the third month, hexagram Guai ䷪ (five yang lines resolving away one yin); the fourth month, hexagram Qian ䷀ (six yang lines, pure yang)—after this, yin qi begins to be born—the fifth month, hexagram Gou ䷫ (one yin line born); the sixth month, hexagram Dun ䷠ (two yin lines growing); the seventh month, hexagram Pi ䷋ (three yin, three yang); the eighth month, hexagram Guan ䷓ (four yin lines flourishing); the ninth month, hexagram Bo ䷖ (five yin lines stripping away the yang); the tenth month, hexagram Kun ䷁ (six yin lines, pure yin).

The third lunar month (the chen month), in which Guyu falls, corresponds precisely to hexagram Guai ䷪. The image of hexagram Guai consists of Dui (☱, marsh) above and Qian (☰, heaven) below, and it is thus also called "Marsh over Heaven, Guai." Its six lines, from bottom to top, are five yang lines followed by a single yin line at the very top—five yang lines below, striving vigorously upward, about to "resolve" (jue), to "guai," away that single yin line at the very top. This is the image of "five yang lines resolving away one yin line," the juncture at which the yang qi has reached great abundance and is about to sweep away the last remnant of yin to become pure yang (hexagram Qian).

How exquisitely fitting it is to match Guyu with hexagram Guai! Guyu is precisely late spring, the season when the yang qi is about to reach fullness and the last remnants of cold (the remnant yin) are about to be exhausted—"at Qingming, snow ceases; at Guyu, frost ceases"—and is not that last trace of frost and cold which "ceases" precisely the topmost yin line that hexagram Guai is about to "resolve" away$2 After Guyu comes Start of Summer; after hexagram Guai comes hexagram Qian—the solar terms' meeting of spring and summer corresponds, seamlessly, to the hexagrams' turn from near-extremity to purity.

Section 2: "Guai Means Resolving" — The Great Principle of Firmness Resolving Away Yielding

What does the character "Guai" (夬) mean$3 The Tuan commentary of the Book of Changes states at the outset: "Guai means resolving; it is the firm resolving away the yielding." The "Appended Statements, Part II" likewise says: "Guai means resolving." "Guai" is "jue" (决, resolving)—it is the firm (yang) resolving away the yielding (yin).

What does "resolving" (jue) mean$4 To resolve is to decide, to remove, to burst forth and break through, to sweep clean and exhaust. The five yang lines have accumulated tremendous force, and are about to thoroughly resolve away that final yin line entrenched at the top—this is an unstoppable, vigorously ascending force of breakthrough. On the natural level, it corresponds to the process, from late spring to early summer, in which yang qi bursts through the remnant cold, sweeping the last chill entirely away with warmth; on the cosmic level, it corresponds to the great trend of brightness resolving away darkness, of growth resolving away withering decay.

The Tuan commentary continues: "Guai means resolving; the firm resolving away the yielding. It is vigorous yet joyous; it resolves yet remains harmonious." (健而说，决而和) Guai is resolving, the firm resolving away the yielding. It (the lower trigram Qian) is vigorous, while (the upper trigram Dui) it is joyous—maintaining harmony even in the midst of resolute decision.

These eight characters are of the utmost importance: "vigorous yet joyous, it resolves yet remains harmonious"—the lower trigram Qian signifies vigor, the upper trigram Dui signifies joy, and so, though Guai is a fierce act of "resolving," it is not a violent resolving that leaves both sides wounded, but rather "resolving yet remaining harmonious"—even while resolving away the remnant yin, the harmony of Heaven and Earth is preserved. This is exactly like Guyu's ceasing of frost: warm qi resolves away the cold frost not through some cataclysmic struggle, but through a transformation that arrives as naturally as water finding its channel, gentle as a soft wind and mild rain—"resolving yet harmonious."

Why is "the firm resolving away the yielding" endowed with such a positive significance$5 Behind this lies the consistent value orientation running throughout the Book of Changes: yang represents brightness, growth, the noble person, and the proper Way; yin represents darkness, withering decay, the petty person, and deviance. Five yang lines resolving away one yin line symbolizes brightness resolving away darkness, the noble person resolving away the petty person, the proper Way resolving away deviance.

This is a righteous, irreversible trend within Heaven and Earth—when righteous qi has accumulated to sufficient strength, it will inevitably burst through and sweep away the last remaining trace of deviance, returning Heaven and Earth to brightness and purity. Guyu's "rain giving birth to the hundred grains," its vitality resolving away the remnant cold, is precisely this great cosmic principle playing out concretely within the course of a single year.

Section 3: The "Resolving" of the Noble Person — Resolving Away the Petty Person and Resolving Away One's Own Private Desires

The "resolving" of hexagram Guai is not merely an image of Heaven and Earth, but also a profound teaching for the Confucian noble person's self-cultivation and governance. The Xiang commentary of the Book of Changes says: "The marsh rises above Heaven—this is the image of Guai. The noble person, taking this as his model, bestows emolument and grace upon those below, while being ever wary of dwelling complacently in his own virtue." (泽上于天，夬。君子以施禄及下，居德则忌。) The waters of the marsh hang suspended high above Heaven (destined eventually to pour down as rain and grace)—this is the image of hexagram Guai. From this the noble person comes to understand that he should extend emolument and grace down to the people below, while remaining ever watchful and wary of dwelling complacently and self-satisfied in his own virtue.

Note well these four characters, "the marsh rises above Heaven"—the waters of the marsh suspended high above Heaven are precisely the image of rain about to fall, yet not yet fallen! The very image of hexagram Guai is itself a picture of "Guyu": the waters of the marsh, gathered in the high heavens, having gathered to their utmost, resolve and pour forth, transforming into the sweet rain that moistens the hundred grains. And what the noble person reads from this picture is "bestowing emolument upon those below"—just as the marsh waters high above resolutely pour down, benefiting the ten thousand things universally, so too should he resolutely bestow his grace upon the people below. This shares precisely the same spirit as Guyu's "rain giving birth to the hundred grains," Heaven's grace descending to reach the multitude.

But the "resolving" of hexagram Guai has a deeper, more difficult layer still—resolving away the "private desire" and "deviance" within one's own heart. The statement for the fifth line reads: "Resolutely, resolutely uprooting the purslane a metaphor for the remaining yin; walking the middle path brings no blame." The Tuan commentary further admonishes earnestly: "Proclaim it within your own city; it is not advantageous to resort immediately to arms, for to exalt force alone will in the end lead to exhaustion." This means: one should begin the work of resolving from one's own city (one's own self, one's own interior), rather than rashly resorting to military force and conquest, for to rely solely on force will, in the end, exhaust its own way. This is a reminder: what true "resolving" must first resolve away is not the enemy without, but the private desires and deviant thoughts within one's own heart.

Still more important is the third line: the noble person, at the moment of resolving away the petty person, must be firm and resolute ("resolutely, resolutely"), yet must also maintain a heart of wariness and caution, and must not presume upon his own strength or grow arrogant. This is precisely the deepest wisdom of hexagram Guai—"the noble person, resolutely, resolutely" and yet still needing to be "wary and cautious."

Resolving is necessary, is proper; but the more one finds oneself in the powerful position of five yang lines resolving away one yin, with victory already assured, the more one must guard against sliding into arrogance, into violence, into "subduing others through force." Though the yang of Guyu is abundant, it must still "resolve yet remain harmonious"; though the noble person's virtue is strong, he must still be "resolutely, resolutely" firm and yet "wary and cautious." This sense of proper measure—"maintaining wariness amid strength, maintaining harmony amid resolution"—is precisely the most precious teaching that hexagram Guai has bequeathed to later generations.

Section 4: "Resolving Yet Harmonious" and "Fullness Invites Loss" — Guyu's Admonition Against Overflowing Fullness

The five yang lines of hexagram Guai already present an image of yang qi filled to abundance, nearing its extreme. And the Book of Changes and the Book of Documents have always held a profound wariness toward "fullness."

The "Counsels of Great Yu" chapter of the Book of Documents says: "Fullness invites loss; humility receives benefit—this is the constant Way of Heaven." (满招损，谦受益，时乃天道) Self-satisfaction invites harm; humility receives benefit—this is the constant principle of the Way of Heaven. The five yang lines of hexagram Guai resolving away one yin line appear, on the surface, entirely auspicious, the yang firmness nearing its very extreme—but precisely at this point of "nearing the extreme," the crisis of "fullness inviting loss" lies concealed. For after yang reaches its extreme comes the birth of yin (after Guai comes Qian, and after Qian comes immediately Gou, in which one yin line begins to be born). Fullness at its extreme must give way to deficiency; abundance at its extreme must give way to loss—this is the constant Way of Heaven.

The solar term of Guyu stands precisely at this position of "fullness nearing its extreme." What it teaches humanity is not only the forward-striving spirit of seizing the rain to sow with urgency, but also an admonition against overflowing fullness, in the spirit of "fullness inviting loss": the more vitality surges and yang qi nears its fullness, the more one must hold fast to a heart of humble restraint and wariness, must not grow arrogant with abundance, must not exhaust the resource to its last drop, must not act wantonly.

This converges, by a different path yet toward the same end, with the Daoist principle of "accomplishing one's task yet not dwelling upon it," and with the Confucian noble person who is "resolutely, resolutely" firm yet "wary and cautious"—together they point toward that deepest wisdom of the Way of Heaven: remaining clear-headed at the very height of flourishing, and holding a heart of humble restraint when nearing fullness. That a single Guyu should contain, simultaneously, these two teachings—"vigorous advance" and "wariness of fullness"—which appear contradictory yet are in fact complementary, is precisely the most dialectical, most harmonious philosophy that hexagram Guai bestows upon Guyu.

Section 5: Guai, Qian, and Gou — The Code of the Heavenly Way in the Cycle of Yin and Yang, Read Through Guyu

Placing Guyu's hexagram Guai back within the tightly interlocking chain of the twelve sovereign hexagrams, we can perceive a profoundly deep code concerning "the cyclical nature of the Heavenly Way."

Observe the close succession of these three hexagrams: the third month, hexagram Guai (five yang lines resolving away one yin) → the fourth month, hexagram Qian (six yang lines, pure yang) → the fifth month, hexagram Gou (one yin line beginning to be born). These three steps enact precisely the complete turning point of "yang nearing its extreme—yang at its extreme—yang's extreme giving birth to yin." Hexagram Guai (in which Guyu falls) is "nearing the extreme"—five yang lines already abundant, just about to resolve away the last yin line; hexagram Qian (in which Start of Summer falls) is "the extreme"—six lines of pure yang, the yang qi having reached its very pinnacle; and the hexagram Gou that immediately follows (the fifth month, in which the Summer Solstice falls) is already "yin being born"—beneath that seemingly all-conquering pure yang, a single yin line has quietly sprouted at the very bottom.

This chain of "Guai → Qian → Gou" conceals one of the deepest insights of the Book of Changes: within the very height of flourishing, its opposite is inevitably concealed; yang nearing its extreme is already yin nearing its birth. Guyu's hexagram Guai stands precisely at the most crucial point of this insight—it is "nearing the extreme," the eve of the liminal moment at which the yang qi is about to reach its summit (Qian), yet is also about to turn from that very summit toward decline (Gou). Standing at this position of Guyu and looking back, the ancients perceived not a single line rising ever upward (yang qi endlessly increasing), but an eternally recurring circle (yang's extreme turning to yin, yin's extreme turning to yang, cycling without end).

The "Appended Statements, Part II" of the Book of Changes says: "When the sun goes, the moon comes; when the moon goes, the sun comes; sun and moon push against each other, and brightness is thereby born. When cold goes, heat comes; when heat goes, cold comes; cold and heat push against each other, and the year is thereby completed." When the sun departs, the moon arrives; when the moon departs, the sun arrives; sun and moon push against each other in mutual succession, and brightness is thereby produced; when cold departs, heat arrives; when heat departs, cold arrives; cold and heat push against each other in mutual succession, and the year is thereby formed.

These four characters, "cold and heat push against each other" (寒暑相推), say everything about the cycle of the Heavenly Way enacted by Guai, Qian, and Gou—there is no eternal flourishing, nor any eternal decline, only the ceaseless "mutual pushing" of flourishing and decline pushing against each other, of yin and yang surging against each other, without end. Guyu's hexagram Guai is precisely the most tension-filled link in this chain of "mutual pushing," a link that both carries forward what came before and opens what follows: it succeeds the "four yang lines" of hexagram Dazhuang (the accumulation of growth), and is about to open the way to the "pure yang" of hexagram Qian (the summit of growth) and the "one yin" of hexagram Gou (the sprouting of decline).

A single Guyu is thus bound up with the entire code of the Heavenly Way in the Book of Changes—"flourishing and decline pushing against each other, cycling without end." To understand the position of Guyu's hexagram Guai within this chain is to understand that profound and harmonious Chinese cosmology of time, in which "autumn and winter are already glimpsed within the very height of spring's flourishing, and the birth of yin is already foreknown within yang's approaching fullness."