Hexagram 51: Thunder (Shock)

Written by Orbitarot · Sources: James Legge, The Yi King (The I Ching), 1882 (judgment and lines); plain readings our own · Updated October 7, 2026

Hexagram 51 in plain words

Thunder over thunder: one crash after another, rolling across the sky. Tradition describes the shock coming, people gasping, then laughing, and a wise person who is so composed that they do not even spill the sacred wine during the thunder. The arousing force here is the energy that wakes up all things in spring.

The hexagram teaches how to meet sudden events. Fear is natural, but it does not have to take control. The commentary says the wise person, faced with thunder, sets their life in order and examines themselves. In other words, a shock is a chance to ask what is loose or careless in your own conduct, and to tighten it. People who are inwardly steady recover quickly and can even laugh afterward. Those who panic, flail or freeze lose more than the event itself would have taken. Do not chase what was lost in the confusion; often it comes back of its own accord. When everything is shaking, hold on to what is central and let the rest settle. The storm passes.

The judgment

Kăn gives the intimation of ease and development. When (the time of) movement (which it indicates) comes, (the subject of the hexagram) will be found looking out with apprehension, and yet smiling and talking cheerfully. When the movement (like a crash of thunder) terrifies all within a hundred lî, he will be (like the sincere worshipper) who is not (startled into) letting go his ladle and (cup of) sacrificial spirits.

Translation: James Legge, 1882 (public domain).

The image

(The trigram representing) thunder, being repeated, forms Kăn. The superior man, in accordance with this, is fearful and apprehensive, cultivates (his virtue), and examines (his faults).

From Legge's Appendix II (the Great Symbolism), The Sacred Books of the East, vol. 16, 1882 (public domain).

In plain words: Thunder comes again and again and everything shakes. Let the shock wake you up: take it seriously, set your house in order, and look honestly at your own faults.

The six lines

Read only the lines that changed in your reading. Lines are counted from the bottom.

Line 1 (bottom)

The first NINE, undivided, shows its subject, when the movement approaches, looking out and around with apprehension, and afterwards smiling and talking cheerfully. There will be good fortune.

The shock comes, and you gasp; then laughter follows. Because you take it seriously at first, it ends well.

Line 2

The second SIX, divided, shows its subject, when the movement approaches, in a position of peril. He judges it better to let go the articles (in his possession), and to ascend a very lofty height. There is no occasion for him to pursue after (the things he has let go); in seven days he will find them.

The shock brings danger, and you lose a great deal and climb the hills to escape. Do not chase what is lost; in seven days it comes back.

Line 3

The third six, divided, shows its subject distraught amid the startling movements going on. If those movements excite him to (right) action, there will be no mistake.

The shock leaves you dazed. If it moves you to act rather than freeze, you avoid harm.

Line 4

The fourth NINE, undivided, shows its subject, amid the startling movements, supinely sinking (deeper) in the mud.

The shock gets bogged down in mud. You cannot respond with energy right now; wait for clearer footing.

Line 5

The fifth SIX, divided, shows its subject going and coming amidst the startling movements (of the time), and always in peril; but perhaps he will not incur loss, and find business (which he can accomplish).

Shocks come and go, one after another. It is risky, but nothing essential is lost if you keep to your central task.

Line 6 (top)

The topmost SIX, divided, shows its subject, amidst the startling movements (of the time), in breathless dismay and looking round him with trembling apprehension. If he take action, there will be evil. If, while the startling movements have not reached his own person and his neighbourhood, (he were to take precautions), there would be no error, though his relatives might (still) speak against him.

The shock brings confusion and wild looks around. Moving now is unwise; if trouble hits your neighbor first, take note and prepare, even if people talk.

Related hexagrams

All three relations have traditional Chinese names (cuo gua for the opposite, zong gua for the inverse, hu gua for the nuclear). Many modern readers use the opposite as the shadow side of a situation, the inverse as the same moment seen from the other side, and the nuclear hexagram as its inner core.

If one line changes

With a single changing line, hexagram 51 turns into:

Learn more: what the I Ching is, how to read changing lines, the eight trigrams, how to cast with coins or yarrow.

Hexagram 51 in love and relationships

In love, a sudden event or revelation may shake things up. Breathe, avoid reacting in panic, and use the moment to look honestly at where the relationship stands.

Hexagram 51 for work and decisions

At work, an unexpected change or shake-up may arrive. Stay calm, focus on your core responsibilities, and use the jolt to correct what was slack.

Questions