The name 名
Xu carries two senses: ‘need,’ something still lacking, and ‘wait,’ as the Commentary says outright: xu means xu, ‘to tarry.’ The ancients heard in its sound the patter of rain, when one cannot go out and must bide one’s time. Together: waiting while supplying what is lacking.
The image 象
Kan, water, cloud and danger, lies above; Qian, heaven and strength, below. Clouds have risen into the sky but have not yet turned to rain: the time is not ripe. Qian’s vigour could charge ahead, but danger lies in front and forcing it gains nothing, so one waits. The lines move from outskirts to sand to mud, step by step toward the water, and the closer they come the more care they need.
Layers of images 層
A gua can be read on several levels at once: the trigrams as members of a family (father, mother, eldest to youngest sons and daughters), the six lines as ranks in an organisation (from newcomer to ruler), and as forces of nature and animals. Each extra level adds meaning to the line texts.
Read as a family
Below is Qián, the father; above is Kǎn, the middle son. The father has full strength yet waits at the bottom, with the middle son, the trigram of the pit, ahead of him. Senior strength meeting a younger generation’s risk cannot simply push through; it must wait for the right moment. Waiting here is not weakness but the restraint of someone strong.
The judgment, “with trust, bright success”: where does the brightness come from? Lines 3–5 form a nuclear Lí, light. Within the waiting there is clarity, because the heart has trust and sees what is ahead.
Line 2, “waiting on the sand; there is some talk”: from the outskirts to the sandbank, closer to the water. Lines 2–4 form a nuclear Duì, the mouth: people start to gossip and find small fault. The line is central, so it ends well; there is no need to answer back.
Line 5, “waiting with wine and food; steadiness is auspicious”: the ruler’s seat is the centre of Kǎn, which is water and also wine. While waiting, the one at the top lays out food and drink and keeps everyone settled: the composure a leader owes people when the situation is still unclear.
Top line, “three uninvited guests arrive; honour them and it ends well”: the three guests are the three yang lines of the lower Qián, which have waited all along and now come up. The top line corresponds with Line 3; meet them with respect and danger turns to good fortune.
Turn Xū over and you get Sòng, Conflict, built from the same Qián and Kǎn. Facing the same danger, Xū waits patiently while Sòng fights head-on. That is why the Xu Gua says food and drink will bring disputes: when many people wait, sharing out the resources breeds quarrels. If you can wait well, the conflict need never come.
Change all six lines of Xū and you get Jìn, Advance: the sun rising over the earth. The hidden side of waiting is moving forward. Someone who truly knows how to wait is not standing still but gathering strength for the advance; when the moment comes, they go.
In sequence 序
物穉不可不養也，故受之以需；需者飲食之道也。
The Sequence says that the immature cannot go unnourished, so Xu follows; Xu is the way of food and drink. Meng is youth, and youth must be fed. After Zhun’s founding and Meng’s teaching, society needs time to recover and gather resources. Rest is for the longer road.
The judgment 辭
需：有孚，光亨。貞吉，利涉大川。
Sincerity, bright success; steadfastness is auspicious; it is fitting to cross the great river. Both central places, lines 2 and 5, are yang: solid within, and what is solid within shows without, hence sincerity. Lines 3–5 form an inner Li, brightness, hence ‘bright success.’ With Qian’s strength below, once preparation is complete the river can be crossed. Waiting is not passive watching but holding to sincerity and the right path until conditions mature.
Commentary on the judgment 彖
彖曰：需，須也，險在前也；剛健而不陷，其義不困窮矣。需，有孚，光亨，貞吉，位乎天位，以正中也。利涉大川，往有功也。
The Commentary says xu means to tarry, for danger lies ahead; firm and strong, one does not sink, and by right reason one will not be reduced to straits. ‘Occupying heaven’s seat, correct and central’ points to line 5. ‘It is fitting to cross the great river; going forth brings achievement’: set out when ready and the effort bears fruit.
The great image 象
象曰：雲上於天，需；君子以飲食宴樂。
Clouds rise up to heaven: Xu. The noble person, accordingly, eats, drinks, feasts and is at ease. Food and drink nourish the body; feasting and ease harmonize the mind. Both must be tended, so one does not falter when the test comes. Cheng Yi wrote that this is what is meant by dwelling in ease while awaiting one’s mandate: live an ordinary life, fill oneself out, and be ready when called.
The six lines 爻
Ruling line Line 5 rules: the Commentary’s ‘occupying heaven’s seat, correct and central’ names it. Yang in a firm place, central and correct, waiting at ease amid food and drink, it voices the heart of the hexagram.
The path of the six lines, bottom to top
Xū’s six lines are a wait that comes step by step closer to dangerous water. Line 1 is still far off in the outskirts and only needs to keep to the ordinary; Line 2 reaches the sandbank, where gossip starts, but being central it ends well. Line 3, at the top of the lower trigram, sinks into the mud closest to the danger and invites raiders. Line 4 has entered Kǎn and there is blood; it can only go along and climb out of the pit; Line 5, on the ruler’s seat, waits calmly with wine and food in the midst of danger, the model of waiting. The top line falls into the pit, and three uninvited guests arrive; received with respect, they turn the end to good fortune.
初九需于郊，利用恆，无咎。
In plain words
Waiting in the outskirts. It is fitting to persevere in constancy; no blame.
Close reading
Line 1 is farthest from the water above, like the open country beyond the city walls. Yang in a firm place and answered by line 4, it stands on sound footing. All three lower yang lines want to rise, but danger lies ahead, so there is no hurry. The Small Image says it ‘does not brave the hazard’ and ‘does not lose the norm’: it keeps its ordinary pace and measure.
If you drew this line
It is early and the challenge is still far off. Carry on with your ordinary work, wait patiently, and do not fidget.
The Delayed Flight
Someone invited to give a lecture in another city set out early, only for the flight to be delayed while the organizers panicked. Casting a hexagram from the numbers on his boarding pass, he drew the first line of Xu: waiting in the outskirts, persevere, no blame. Xu is waiting, and the first line is far from the water, so there was no real danger; he reckoned on about an hour. He sat calmly while other passengers argued at the counter. An hour later the plane left, and he arrived in time.
九二需于沙，小有言，終吉。
In plain words
Waiting on the sand. There is some small talk against one; in the end, good fortune.
Close reading
Closer to the water, line 2 has reached the sand. Yang in a yielding place, it is not correct but it is central, and centrality outweighs correctness, so it ends well. Lines 2–4 form an inner Dui, the mouth: people begin to talk and criticize. The Small Image says yan, a sandbar rising in the water, ‘is in the middle,’ marking the line’s central, unhurried stance; the small talk does it no harm.
One level deeper
Line 2, “waiting on the sand; there is some talk”: from the outskirts to the sandbank, closer to the water. Lines 2–4 form a nuclear Duì, the mouth: people start to gossip and find small fault. The line is central, so it ends well; there is no need to answer back.
If you drew this line
While you wait, some will grumble. No need to argue or waver; keep to the middle, stay composed, and it will end well.
九三需于泥，致寇至。
In plain words
Waiting in the mud brings bandits.
Close reading
Sand plus water is mud: line 3 presses right against Kan, the bandit, hence ‘brings bandits.’ Yang in a firm place and answered by line 6, it draws that yin partner down, and with it the bandit of Kan. The Small Image says ‘the calamity is outside,’ in the outer trigram, and ‘having brought the bandits oneself, by reverence and caution one is not defeated’: the trouble is self-invited, but seriousness toward oneself and care toward others keep one from ruin.
If you drew this line
You are close to the hazard, and rash moves now invite loss, mostly of your own making. Be serious in bearing and careful in word and deed.
六四需于血，出自穴。
In plain words
Waiting in blood. Getting out of the pit.
Close reading
Line 4 has entered Kan: water, the blood trigram, the pit. It takes the brunt of the three yang lines pressing up from below, and where yin meets advancing yang, blood is drawn. Yet it is yin in a yin place, answered by line 1 and supporting line 5, and it sits at the mouth of the pit, so it ‘gets out.’ The Small Image says it ‘complies and listens’: yielding and willing to heed, it escapes a close call.
If you drew this line
You are at the point of greatest pressure. Do not resist head-on; yield to the current, heed those you can trust, and you will come through a close call.
九五需于酒食，貞吉。
In plain words
Waiting amid wine and food. Steadfastness is auspicious.
Close reading
Yang in a firm place, central in the upper trigram, central and correct: the ruling line and the ideal state of waiting. Kan is water, from which wine is made, hence ‘wine and food,’ echoing the Great Image’s feasting. The Small Image says it is ‘because it is central and correct’: the ease here is not indulgence but nourishing oneself and others from a balanced seat, so the whole realm is fed while the moment ripens.
One level deeper
Line 5, “waiting with wine and food; steadiness is auspicious”: the ruler’s seat is the centre of Kǎn, which is water and also wine. While waiting, the one at the top lays out food and drink and keeps everyone settled: the composure a leader owes people when the situation is still unclear.
If you drew this line
You are well placed; there is no need to fret. Look after body, mind and those around you, keep to what is right, and wait with ease; the moment will come.
上六入于穴，有不速之客三人來，敬之終吉。
In plain words
Entering the pit. Three uninvited guests arrive. Treat them with respect, and in the end, good fortune.
Close reading
At the deepest point of Kan, line 6 ‘enters the pit,’ in contrast to line 4 getting out. Su means to invite; ‘uninvited guests’ is a phrase born here. Answered by line 3, it draws up all three lower yang lines, the three guests, who thereby fulfil ‘crossing the great river.’ Though yin in a yin place, it rides over the ruler in line 5, so the Small Image says ‘though not in its proper place, it has not greatly erred.’ Respect brings good fortune in the end, echoing line 3’s ‘by reverence and caution one is not defeated.’
One level deeper
Top line, “three uninvited guests arrive; honour them and it ends well”: the three guests are the three yang lines of the lower Qián, which have waited all along and now come up. The top line corresponds with Line 3; meet them with respect and danger turns to good fortune.
If you drew this line
Unexpected people or turns may arrive. Do not resist or panic; meet them with courtesy and sincerity, and danger often turns to safety.
Stories 典
Taigong Wang by the Wei River
The Records of the Grand Historian say that Lü Shang, old and poor, fished in hopes of meeting the Lord of the West. Before the Lord went hunting he had divination performed, and it said his catch would be neither dragon nor serpent, tiger nor bear, but the helper of a king. On the north bank of the Wei he met Lü Shang, talked with him and was overjoyed: his late grandfather, the Taigong, had long hoped for a sage to come to Zhou, ‘and my Taigong has long awaited you.’ So he called him Taigong Wang, took him home in his own carriage and made him his teacher. Lü Shang had spent a lifetime building his learning and met his moment only in old age; he later helped King Wu overthrow Shang. Waiting is not empty; it is readying oneself while one waits.
Farming at Nanyang
In his youth Zhuge Liang lived in retirement at Longzhong, farming with his own hands, often chanting the Liangfu Song and comparing himself to Guan Zhong and Yue Yi. The Records of the Three Kingdoms say Liu Bei had to call three times before he was received. In his later Memorial on Dispatching the Troops, Zhuge Liang recalled that he had been a commoner tilling the fields of Nanyang, seeking only to preserve his life in a chaotic age, not to win fame among the lords. In an era of turmoil he did not hawk himself to every warlord; he read, cultivated his aims, and came forth only when someone truly worth serving came to his door. That is ‘dwelling in ease to await one’s mandate,’ and the meaning of ‘crossing the river, going forth brings achievement.’
Insight 悟
Xu teaches that waiting is itself a skill. When danger lies ahead, do not rely on your strength to force it. If the time is not ripe, anxiety helps nothing; better to tend body and mind, build up resources and keep faith. The nearer the decisive moment, the more care is needed, for trouble is often self-invited. Rest is for the longer road; when you are ready, the crossing succeeds.