Challenging / High-Vigilance Hexagram Xun Palace (Wood) · Fifth-Generation Hexagram

Hexagram 21: Biting Through (Shi He)

Shi He (Huo Lei Shi He) · Fire (Radiance) Above Thunder

Hexagram Name
Biting Through · Shi He (Huo Lei Shi He)
Trigram Pair
Upper Li (Fire) · Lower Zhen (Thunder)
Eight-Palace Seat
Xun Palace (Wood) · World Line 5 / Response 2
Related Trio
Nuclear #39 · Opposite #48 · Inverse #22
In the King Wen sequence of the I Ching (Book of Changes), Hexagram 21: Biting Through (Shi He (Huo Lei Shi He)) places the Outer Trigram Li (Fire) (Fire (Radiance), Fire) above the Inner Trigram Zhen (Thunder) (Thunder, Wood). Within the Jing Fang Eight-Palace system of Six Lines divination (Liu Yao), this hexagram belongs to the Xun Palace (Wood) as its Fifth-Generation Hexagram, anchoring the World Line (Shi Yao) on Line 5 and the Response Line (Ying Yao) on Line 2. Fire above and Thunder below, lightning and fire together. This is the image of biting through, of judgement. There is an obstacle that must be removed, and punishment must be strict and clear.

📜 Classical Texts: The Judgment & The Great Image

The Judgment (Gua Ci / Tuan Ci)
Biting Through (Shi He (Huo Lei Shi He))
Success; it is favourable to administer justice.
The Great Image (Da Xiang Zhuan)
Fire (Radiance) Above Thunder
Thunder and lightning; the ancient kings made the penalties clear and the laws exact.

🧭 Trigram Architecture & Four-Hexagram Transformation Graph

At UK MASTER ACADEMY, no hexagram is read in isolation. Classical Chu Yi analysis situates Biting Through within its Upper-Lower trigram dynamic alongside three structural counterparts: the Nuclear Hexagram (hidden internal progression), the Opposite Hexagram (complete Yin-Yang polarity inversion), and the Inverse Hexagram (180-degree perspective reversal):

Structural Dimension Hexagram 21 Specification Metaphysical Role & Cross-System Link
Outer (Upper) Trigram ☲ Li (Fire) · Fire (Radiance) (Fire) Governs the external environment, counterparts, public outcome, and later stage. Attribute: clinging clarity, illumination, discernment. Post-Heaven direction: South.
Inner (Lower) Trigram ☳ Zhen (Thunder) · Thunder (Wood) Governs inner motivation, domestic foundation, and initial stage. Attribute: arousing movement, awakening, decisive action. Post-Heaven direction: East.
Eight-Palace Lineage Xun Palace (Wood) · Fifth-Generation Hexagram World Line at Line 5, Response Line at Line 2. Standard Palace Configuration (Fifth-Generation Hexagram): evaluate the Five-Element generation and restriction between the World Line (Line 5) and Response Line (Line 2).
Nuclear Hexagram (Hu Gua) Hexagram 39: Obstruction (Jian) Formed from Lines 2-3-4 (lower) and Lines 3-4-5 (upper); reveals the latent middle phase and unspoken subtext driving the outcome.
Opposite Hexagram (Cuo Gua) Hexagram 48: The Well (Jing) Inverts all six Yin and Yang lines; exposes the shadow polarity and complementary law when conditions reach their extreme.
Inverse Hexagram (Zong Gua) Hexagram 22: Grace (Bi) Turns the six-line stack upside down; shows how the exact same situation looks from the other party's vantage point.
Medical I Ching & Organ Axis Upper: Heart & Small Intestine System (Fire) · Lower: Liver & Gallbladder System (Wood) Anatomical resonance: eyes, heart, small intestine, cardiovascular vessels and feet, liver, gallbladder, sinews, nervous reflexes. Explore deeper diagnostics in our Body & Five Elements Atlas.

📐 Na Jia Six-Line Matrix (Wen Wang Gua / Six Lines System)

In Six Lines Divination (Wen Wang Gua), each line of Hexagram 21 Biting Through is assigned a Heavenly Stem, Earthly Branch, Five-Element phase, and one of the Five Six-Relatives calibrated against the Xun Palace (Wood) element. Whenever a Six-Relative is absent from the primary six lines, its Hidden God (Fu Shen) is drawn from the pure Palace Head hexagram:

Line Position (Top to Bottom) Na Jia Stem & Branch Six Relative & Hidden God Single-Line Transformed Hexagram
Line 6 (Nine at the Top) Ji Si (Snake) · Fire Offspring (Zi Sun) Transforms into Hexagram 51: The Arousing
Line 5 (Six in the Fifth Place)World Ji Wei (Goat) · Earth Wife and Wealth (Qi Cai) Transforms into Hexagram 25: Innocence
Line 4 (Nine in the Fourth Place) Ji You (Rooster) · Metal Officer and Ghost (Guan Gui) Transforms into Hexagram 27: Corners of the Mouth
Line 3 (Six in the Third Place) Geng Chen (Dragon) · Earth Wife and Wealth (Qi Cai) Transforms into Hexagram 30: The Clinging
Line 2 (Six in the Second Place)Response Geng Yin (Tiger) · Wood Siblings (Xiong Di) Transforms into Hexagram 38: Opposition
Line 1 (Nine at the Beginning) Geng Zi (Rat) · Water Parents (Fu Mu) Transforms into Hexagram 35: Progress

📊 Line-by-Line Commentary: All 6 Moving Lines & Transformations

Counted from the bottom upward (Initial, Second, Third, Fourth, Fifth, and Top), the six lines trace the complete arc of an affair from inception to culmination. When casting with our Three-Coin I Ching Tool or Plum Blossom Divination Calculator, focus on the moving line(s) alongside the resulting Transformed Hexagram:

Line 1 · Nine at the Beginning Yang Line · Parents (Fu Mu) · Water Changes to Hexagram 35: Jin
Line Text: Wearing the stocks so that the toes are hidden, no blame.\n
Lesser Image: Wearing the stocks so that the toes are hidden, in order to stop him from walking further into the wrong.\n

Master Ưng Khiêm's Commentary: The hexagram Shi He (Biting Through) speaks of using punishment and discipline to correct what is wrong, as one bites through food to clear the way. At this first line the fault is still small and the punishment light, stocks upon the feet, and its purpose is to check the wrong at the very outset so that it goes no deeper. I have seen that this is in truth a piece of good fortune, for a small fault found and dealt with early spares a large consequence later.\n

When Line 1 Moves in Divination: Wealth: a small error found in the accounts and corrected at once does no harm. Work: reprimanded for a small fault, take it as a chance to set yourself straight in time. Love: a small quarrel just beginning, settled early, will not become a large one. Health: a small abnormal sign noticed and examined early will put your mind at rest. Decisions: put things right while the problem is still small.\n
Strategic Counsel: A small fault checked in time is itself good fortune; do not resent being corrected, but take it as a chance to mend yourself early.
Line 2 · Six in the Second Place Yin Line · Siblings (Xiong Di) · Wood · Response Line Changes to Hexagram 38: Kui
Line Text: Biting through tender flesh and taking off the nose as well, no blame.\n
Lesser Image: Biting the flesh and taking off the nose, because it rides upon the firm line below and so strikes harder than the case requires.\n

Master Ưng Khiêm's Commentary: This line stands in the central place and deals with wrongdoing fairly easily, like biting into tender meat, but the force it uses is greater than the case requires, so that the act goes too far, as if the nose were bitten off along with it when there was no need. I remind you that although dealing with a wrong is right and necessary, you should still weigh the measure of your response, and not let firmness turn into an excess that causes harm nobody needed.\n

When Line 2 Moves in Divination: Wealth: a bad debt or a dispute is fairly easy to settle, but do not overdo it. Work: disciplining an employee is right, but keep it moderate and avoid undue harshness. Love: correct your partner with a sense of proportion and do not use words that are too heavy. Health: treat the illness thoroughly, but do not overuse strong medicine beyond the proper dose. Decisions: act decisively but keep within measure.\n
Strategic Counsel: Dealing with a wrong is necessary, but keep it in due measure, and do not let firmness become excess.
Line 3 · Six in the Third Place Yin Line · Wife and Wealth (Qi Cai) · Earth Changes to Hexagram 30: Li
Line Text: Biting into dried meat long kept and meeting with poison; a small regret, but no great blame.\n
Lesser Image: To meet with poison, because the place of this line is not fitting, being neither central nor correct.\n

Master Ưng Khiêm's Commentary: This line stands in a place neither correct nor central, so that in dealing with a wrong it meets a stubborn and lingering object, like meat long dried, and even suffers a backlash, as though poisoned. I have seen this as the situation where you tackle a problem and run into opposition, into more difficulty than you had reckoned on, with some cost and some vexation, but nothing that reaches real danger; you need only more patience and more care.\n

When Line 3 Moves in Divination: Wealth: collecting a debt or settling a dispute brings you up against a difficult character, so be patient. Work: dealing with a problem long left standing may meet an unpleasant reaction, so do not be discouraged. Love: settling an old quarrel may stir up hard feelings again, so go about it deftly. Health: an old medicine or method may have mild side effects, so proceed with care. Decisions: be prepared for small difficulties as you clear up what has been left outstanding.\n
Strategic Counsel: When the matter is tough and stubborn, add patience and care, for a small obstacle is not worth losing heart over.
Line 4 · Nine in the Fourth Place Yang Line · Officer and Ghost (Guan Gui) · Metal Changes to Hexagram 27: Yi
Line Text: Biting into dried meat with bone in it and finding a golden arrow. It is favourable to hold firm and upright through hardship; auspicious.\n
Lesser Image: To hold firm and upright through hardship is auspicious, for the bright virtue is not yet fully shown and further effort is needed.\n

Master Ưng Khiêm's Commentary: This line deals with a matter harder still, like biting dried meat with hard bone in it, yet in the very hardship it finds something precious, figured as a golden arrow, the emblem of uprightness and integrity. I explain it so: this is the line of one who must face a great trial and heavy work, and if he can keep his integrity and hold steady through the hardship, the outcome will be good and well deserved.\n

When Line 4 Moves in Divination: Wealth: financial difficulty, but persevere rightly and you will find a valuable way through. Work: a hard task that demands integrity, and getting through it will bring you due recognition. Love: come through a great test in your feelings with sincerity and the bond will be strengthened. Health: an illness hard to cure, but persistence in the right method will bring good results. Decisions: hold your upright position firm even in difficulty.\n
Strategic Counsel: A hard matter is testing your mettle; keep your integrity and hold steady, for a fitting reward waits ahead.
Line 5 · Six in the Fifth Place Yin Line · Wife and Wealth (Qi Cai) · Earth · World Line Changes to Hexagram 25: Wu Wang
Line Text: Biting into dried meat and finding pure gold. Keep yourself upright in the midst of danger and there is no blame.\n
Lesser Image: To keep upright in danger and be without blame, because the handling of the matter is fitting and right.\n

Master Ưng Khiêm's Commentary: This line stands in the honoured seat and deals with wrongdoing justly and clear-sightedly, and what it receives is worthy of the effort, like finding pure gold. I lay stress on this: even in a high position, enforcing discipline carries its own risk and danger, but if you keep your integrity and your caution everything will come right and no fault will be incurred. This is the line that teaches the fairness of the one who holds the scales.\n

When Line 5 Moves in Divination: Wealth: handle a complicated financial matter with fairness and it will bring a large benefit. Work: whoever holds the power of decision must be impartial and careful in dealing with a fault. Love: settle a quarrel fairly and without partiality and the peace will hold. Health: be cautious in treatment and do not grow complacent even when results are good. Decisions: stay fair and careful even while the power of decision is in your hands.\n
Strategic Counsel: In a position with the power to settle great matters, be always fair and careful, for a fitting reward comes to the one who keeps the right path.
Line 6 · Nine at the Top Yang Line · Offspring (Zi Sun) · Fire Changes to Hexagram 51: Zhen
Line Text: Bearing a heavy cangue that covers the ears, inauspicious.\n
Lesser Image: Bearing the cangue that covers the ears, because he would not listen to the clear warning given earlier.\n

Master Ưng Khiêm's Commentary: At the last line, quite unlike the first with its light stocks upon the feet, the punishment is the heaviest of all, the cangue grown so large that it covers the ears, a figure for wrongdoing piled up too long by one who would not hear counsel or warning in good time. I remind you that this is the lesson set against the first line: a small fault mended at once leaves no blame, but a stubborn refusal to listen, until the wrong has grown into a great offence, brings heavy misfortune as its necessary consequence.\n

When Line 6 Moves in Divination: Wealth: debts or financial wrongdoing have piled up too long, and a heavy consequence is hard to avoid. Work: mistakes repeated and never corrected will lead to serious discipline. Love: a long quarrel never resolved will end in a break that cannot be mended. Health: an illness left too long untreated will grow severe and hard to recover from. Decisions: this is a stern warning, and you must change at once.\n
Strategic Counsel: This is a stern bell of warning; if you know you are wrong and still hesitate, the consequence will be heavy, so mend it now while there is time.

🌟 Practical Divination Across Major Life Domains

Overall strategic trajectory of Hexagram 21 Biting Through · UK MASTER ACADEMY

1. Overall Trajectory & Strategic Timing

Fire above and Thunder below, lightning and fire together. This is the image of biting through, of judgement. There is an obstacle that must be removed, and punishment must be strict and clear. Because Li (Fire) (Fire) rides above Zhen (Thunder) (Wood), the hexagram asks you to align inner preparation (arousing movement, awakening, decisive action) with outward execution (clinging clarity, illumination, discernment).

Core Decision Principle: Thunder and lightning; the ancient kings made the penalties clear and the laws exact. At the ruler's fifth position, classical guidance emphasizes: stay fair and careful even while the power of decision is in your hands.

Career and wealth reading for Hexagram 21 Biting Through · UK MASTER ACADEMY

2. Career, Leadership & Financial Strategy

Career & Governance: In the opening phase (Line 1), the counsel for work is clear: reprimanded for a small fault, take it as a chance to set yourself straight in time. As the hexagram matures to its fifth position (Line 5), leadership reaches its decisive test: whoever holds the power of decision must be impartial and careful in dealing with a fault. Anchor your authority on the World Line (Line 5) while observing how counterparts respond at Line 2.

Wealth & Capital Allocation: Early financial posture requires discipline: a small error found in the accounts and corrected at once does no harm. When conditions ripen at the fifth line, capital movement shifts: handle a complicated financial matter with fairness and it will bring a large benefit. In Six Lines casting, examine the Wife and Wealth (Qi Cai) line within the Xun Palace table above to judge liquidity and timing.

Love, marriage, and family dynamics in Hexagram 21 Biting Through · UK MASTER ACADEMY

3. Relationships, Marriage & Family Harmony

Relational harmony depends on the resonance between the Inner Trigram (Zhen (Thunder), self/home) and Outer Trigram (Li (Fire), partner/environment). In the developing inner stage (Line 2), relationship dynamics indicate: correct your partner with a sense of proportion and do not use words that are too heavy. At maturity (Line 5), the bond reflects: settle a quarrel fairly and without partiality and the peace will hold.

Remember to cross-check the Nuclear Hexagram (Hexagram 39: Obstruction) when unspoken emotional expectations or family pressures sit beneath the surface.

Health and Five-Element constitutional balance in Hexagram 21 Biting Through · UK MASTER ACADEMY

4. Health, Constitutional Qi & Medical I Ching

In classical Medical Yi (Yi Yi), Li (Fire) corresponds to the eyes, heart, small intestine, cardiovascular vessels, whereas Zhen (Thunder) governs the feet, liver, gallbladder, sinews, nervous reflexes. Early moving-line diagnostics note: a small abnormal sign noticed and examined early will put your mind at rest. At the uppermost extreme (Line 6), guard against overextension: an illness left too long untreated will grow severe and hard to recover from.

Cross-reference your birth chart's Useful God in Four Pillars of Destiny (BaZi) and inspect meridian-organ resonances in our Body and Five Elements Atlas whenever chronic fatigue or seasonal flare-ups arise.

Five-Element timing and auspicious directions for Hexagram 21 Biting Through · UK MASTER ACADEMY

5. Five-Element Resonance, Timing & Spatial Alignment

🌿
Palace Element
Wood (Xun Palace)
🧭
Key Directions
Outer: South · Inner: East
📅
Peak Seasonal Qi
Spring (Lunar Months 1 to 3; Yin and Mao branches)
🎨
Harmonizing Palette
Emerald green, jade, forest tones

Number Resonance & Plum Blossom Numerology Application

When phone sequences, vehicle plates, or personal identifiers map onto Hexagram 21: Biting Through under Pre-Heaven Bagua numerology, they carry the energetic signature of Li (Fire) (Fire) over Zhen (Thunder) (Wood). In authentic Eastern metaphysics, evaluate whether the Palace element (Wood) supports your personal Useful God (Yong Shen) in the Four Pillars of Destiny before judging suitability.

❓ Frequently Asked Questions About Hexagram 21: Biting Through

Is Hexagram 21 Biting Through (Shi He) auspicious or inauspicious in the I Ching?
Hexagram 21 Biting Through (Shi He (Huo Lei Shi He)) is classified as a Challenging / High-Vigilance Hexagram. Its classical Judgment states: Success; it is favourable to administer justice. In authentic divination, however, good or ill fortune depends on the specific question asked, which of the six lines are moving, and how the Palace and Use-God elements interact with the month and day of casting.
What are the Upper Trigram, Lower Trigram, and Eight-Palace positions of Hexagram 21?
Hexagram 21 places Li (Fire) (Fire (Radiance), Fire) above Zhen (Thunder) (Thunder, Wood). In Jing Fang's Eight-Palace system, it belongs to the Xun Palace (Wood) as the Fifth-Generation Hexagram, with the World Line on Line 5 and the Response Line on Line 2.
What are the Nuclear, Opposite, and Inverse hexagrams of Hexagram 21 Biting Through?
Its Nuclear Hexagram (Hu Gua, hidden middle development) is Hexagram 39 Obstruction (Jian); its Opposite Hexagram (Cuo Gua, full polarity inversion) is Hexagram 48 The Well (Jing); and its Inverse Hexagram (Zong Gua, overturned perspective) is Hexagram 22 Grace (Bi).
Which Transformed Hexagrams arise when each of the 6 lines of Hexagram 21 moves?
Single moving-line transformations for Hexagram 21 are: Line 1 changes into Hexagram 35 Progress (Jin); Line 2 changes into Hexagram 38 Opposition (Kui); Line 3 changes into Hexagram 30 The Clinging (Li); Line 4 changes into Hexagram 27 Corners of the Mouth (Yi); Line 5 changes into Hexagram 25 Innocence (Wu Wang); Line 6 changes into Hexagram 51 The Arousing (Zhen).
How can I cast Hexagram 21 using traditional Three-Coin, Six Lines, or Plum Blossom methods?
You can cast and analyze Hexagram 21 online free of charge using UK MASTER ACADEMY's I Ching Three-Coin Casting tool, the Wen Wang Gua Six Lines Na Jia Chart calculator, or the Plum Blossom Numerology (Mei Hua Yi Shu) calculator.
Authored & Verified by Master Ưng Khiêm (Trần Quốc Dũng) · UK MASTER ACADEMY

Part of the 64-Hexagram & 384-Line Classical I Ching Compendium by UK MASTER ACADEMY, synthesizing Zhouyi Zhengyi, Jing Fang's Eight-Palace Na Jia lineage, and Shao Yong's Plum Blossom Numerology.

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