I Ching / Hexagram 21

Hexagram 21: Shi Ho, Biting Through

Speaks of an obstacle that keeps things from coming together and must be removed decisively: biting down firmly, administering justice, and setting clear limits.

Fire over Thunder. Thunder and lightning come together: force and clarity act at once.

The situation

There is an obstacle keeping things from fitting together, like something stuck between your teeth. For union to be possible, you have to bite down decisively and get rid of it. This is a hexagram of justice and clear limits: resolving the conflict takes energy and lucidity.

The advice

It serves you to face the problem head-on, with firmness and fair judgment, before it festers. Avoid both cruelty and softness: the response must be proportionate.

The judgement

The Judgment of Shi Ho is brief: it promises success and says it is favorable to administer justice. The drawing of the hexagram suggests an open mouth with something lodged between the teeth, and the meaning follows from that: as long as the obstruction stays in the way, the jaws cannot close and union is impossible. Tradition applies it to lawsuits, punishments, and laws, and advises that penalties be clear and proportionate, neither cruel nor soft. Read today, the judgment speaks of any situation blocked by one specific element: a lie poisoning a team, a person who sabotages, a misunderstanding no one dares to name, an unpaid debt. Working around it only makes it bigger. It has to be identified with clarity and dealt with energetically, however uncomfortable that may be. Success comes when the obstacle is gone and what was separated can fit together again.

Fire over Thunder: the two trigrams

Below is Thunder, energetic movement; above is Fire, the clarity that illuminates. The image joins thunder and lightning, force and light. Resolving a conflict takes both: without clarity, energy strikes blindly and turns into abuse; without energy, clarity understands the problem and leaves it untouched. The shape of the hexagram reinforces the idea: a firm line at the bottom and another at the top are the jaws, and the fourth line, also firm, is the obstacle caught between them. Thunder pushes up from below to bite, and Fire, from above, makes it possible to see what needs to be cut and how far. Together they describe justice that acts with both resolve and judgment.

The six lines

  1. First line. You receive a mild warning as you take your first misstep. That small check stops you in time and prevents a greater harm.
  2. Second line. You bite easily and perhaps use too much force. Even if you overdo it a little, the cause is just and the mistake is minor.
  3. Third line. You confront an old, festering matter that leaves a bad taste. There is some discomfort, but acting was necessary.
  4. Fourth line. You bite into something hard and meet resistance. Persevere with integrity and effort: overcoming the difficulty brings good fortune.
  5. Fifth line. You take on a delicate case and arrive at the just solution. Stay aware of the risk and act fairly.
  6. Sixth line. You refuse to heed the warnings and dig in on your mistake. That deafness leads to serious consequences.

The archetype: The Judge

The Judge arrives in a place where something has festered: an unpunished crime, an accepted lie, an abuse everyone knows about and no one names. Her desire is to restore order, to put each thing back in its place so the community can close ranks again. Her conflict is one of measure: she must act firmly without sliding into revenge, and uncover the truth when everyone has reasons to hide it. Often the obstacle turns out to be someone powerful, or someone close. Her risk is twofold. She may bite too hard and become an executioner, or give in to comfort and put off the decision until the problem overwhelms her. Her worth is measured by the proportion of her sentence.

In literature

  • Measure for Measure (William Shakespeare, 1623). Duke Vincentio leaves Vienna in Angelo's hands and stays in the city disguised as a friar. From there he watches his deputy sentence Claudio to death and demand Isabella's body in exchange for his life. In the final scene, before the city gates, the Duke throws off his habit, unmasks Angelo, and condemns him measure for measure, until Mariana and Isabella plead for mercy and justice is tempered.
  • The Merchant of Venice (William Shakespeare, 1600). It echoes the trial in the fourth act. Shylock demands the pound of Antonio's flesh set out in the bond, and Portia, disguised as a doctor of law, first asks him for mercy and then grants him the flesh on one condition: that he not shed a single drop of blood. It is the delicate case of the fifth line, resolved with wit, although the final sentence against Shylock is extremely harsh.
  • Oedipus Rex (Sophocles, 429 BC). Plague ravages Thebes and the oracle demands that Laius's murderer be punished. Oedipus, king and judge, publicly curses the culprit, questions Tiresias, Creon, and the old shepherd, and bites into the truth even as Jocasta begs him to stop. The obstacle turns out to be himself. When he discovers it, he gouges out his eyes with his mother's brooches and asks for the exile he himself had decreed, carrying out the just sentence to the end.

In history

The Nuremberg Trials (1945–1946). Between November 1945 and October 1946, an international tribunal tried the leading surviving Nazi officials. Faced with the temptation of summary executions, the Allies chose a trial with prosecution, evidence, and defense, which ended in death sentences, prison terms, and three acquittals. The episode embodies Shi Ho: a monstrous obstacle tackled with energy and clarity, so that justice, rather than revenge, could rebuild order.

For writers

Something is stuck in the way, blocking progress: a lie, an obstacle, a culprit. Write the scene in which a character decides to cut it out once and for all and face the consequences.

Hexagram 21 gives structure to a plot of conflict and resolution. The setup presents a community, a family, or a couple that can't come together because something stands in the middle: a secret, an unpunished culprit, a debt. Everyone works around it. The turning point comes when the protagonist decides to bite: they investigate, accuse, confess, or break away, and the obstacle proves harder than expected, perhaps because it involves someone they love or the protagonist themselves. The resolution depends on proportion: a just response lets the parties come back together, and an excessive one opens a new wound. The mistake to avoid is resolution without cost, the villain who collapses at the first push; the bite needs to meet resistance and leave a bitter aftertaste.

Frequently asked questions

What does hexagram 21 of the I Ching mean?

Shi Ho, Biting Through, describes an obstacle that keeps things from fitting together, like something stuck between your teeth. It advises facing it head-on and removing it with energy and fair judgment. It is the hexagram of justice, clear limits, and firm, proportionate decisions.

What does hexagram 21 mean in love?

It signals that something specific is coming between the two of you: a lie, a third person, unspoken resentment, or a fundamental disagreement. Union will only be possible if it is named and resolved. It calls for honesty and firmness, without needless harshness, and warns that putting off the conversation hardens the problem.

Is hexagram 21 favorable?

Yes. The judgment promises success, though it demands action. It is favorable for resolving conflicts, claiming what is fair, setting limits, and making difficult decisions. It turns unfavorable when warnings are ignored or when the response is disproportionate, whether through too much punishment or too much leniency.

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Published on October 4, 2026 · updated on October 18, 2026.