Hexagram 27, Yí (Nourishment): The Mouth and What Fills It

Look at the figure of Hexagram 27, 頤 Yí, Nourishment and you are looking at a mouth. Two solid yang lines seal it top and bottom — the firm upper and lower jaw — and four broken yin lines lie hollow in the space between, like the open cavity a mouth encloses. The Chinese name means the jaw, and by extension the act the jaw performs: to feed, to nourish, to keep something alive by what you put into it. Nearly everything this hexagram has to say is folded into that one picture, so it repays a slow look. (If a hexagram's lines and trigrams are still new terrain, our guide to lines and trigrams builds one from the ground up.)

Thunder under the mountain

A hexagram is two trigrams stacked. Yí sets ☳ thunder below and ☶ mountain above — movement underneath stillness. Watch a mouth chew and you see exactly this: the lower jaw works while the upper jaw holds steady. The classical image drawn from the pairing, thunder beneath the mountain, turns the mouth into a rule of conduct — the wise person guards the words that leave the mouth and moderates the food that enters it. Both directions matter. What comes out and what goes in are the same faculty seen from two sides, and the hexagram never lets you forget that nourishing is a two-way traffic through a single gate.

Observe what is nourished

The judgment gathers the whole teaching into two moves. First, observe what is nourished: watch whom a person feeds and what they take in — meals, information, the company they keep — and you can read that person to the ground, because what you cultivate and what you consume are the truest record of who you are. Second, seek your own filling of the mouth: real sustenance has to be earned by you and screened by you, and no one can chew your food for you. The counsel is not "wait to be fed" but "take charge of both the sourcing and the vetting of everything you let in." Perseverance in that discipline is what the judgment calls good fortune.

The six positions of the mouth

Read from the bottom up, the lines run from feeding wrongly to feeding others rightly. Anchor each to what the line actually says:

• Line 1. You set aside your own inner sufficiency — your "sacred tortoise," the treasure you already carry — to gape enviously at another's plate. Abandoning what nourishes you from within is the first and clumsiest error of the mouth. Misfortune.
• Line 2. You beg nourishment downward, from sources that owe you nothing and sit below you. Support sought against the grain of things gives way the moment you lean on it.
• Line 3. You reject real nourishment for what merely stimulates — the diet of pure appetite. Persist in that and a decade goes barren; nothing built on stimulation lasts.
• Line 4. Now the figure turns. You look downward for support in order to feed others in turn, watchful as a crouched tiger. The same downward reach that failed at line 2 succeeds here, because hunger is put to right use.
• Line 5. You know you cannot provide for everyone alone, so you stay in place and lean on those genuinely able, nourishing through them. Sound — but do not attempt the great crossing yet; your footing is borrowed.
• Line 6. You have become the one everyone else draws nourishment from. The weight has sunk to its heaviest. Carry it with constant awareness of the danger and fortune follows — and only here, at the top, does the great crossing finally open.

The lower jaw and the upper jaw

The split between the two trigrams is also the split in the reading. The three lower lines — thunder, the moving jaw — are all cautionary: envy, misplaced begging, restless appetite, each a way of feeding that turns on itself. The three upper lines — mountain, the still jaw — turn outward and steady: nourishing others, drawing on the capable, bearing the weight of being everyone's source. The arc is the distance between a mouth that only takes and a mouth that has learned to feed, and the figure warns at its summit that even rightful nourishing carries danger once everyone depends on you.

Paired with Great Excess, flipped line for line

Most adjacent hexagrams in the sequence are one figure turned upside down. Yí is not: turn this mouth over and it is still the same mouth, unchanged. Its true counterpart is reached another way — flip every line to its opposite, solid for broken and broken for solid, and the hollow mouth becomes a figure heavy in the middle and thin at the ends: Hexagram 28, Dà Guò, Great Excess. The two are joined not by inversion but by exact opposition, which is why they sit together in the sequence. A mouth that is all hollow can receive and give; a beam that is all core bends under its own weight. Read as a pair, they set the emptiness that nourishes against the fullness that overloads.

Reading Yí when you cast it

If Yí comes up with no moving lines, a still figure, read it as a season for auditing your intake and your output: what are you feeding, and what have you let feed you? The judgment's two questions are the whole of the still reading. If lines are moving, let each one name your exact position at the mouth — the changing-lines guide covers how to weigh several at once — and notice whether you sit among the lower lines that feed poorly or the upper lines that feed well. Throughout, hold the register: the figure is arranging your attention, not forecasting your fortune. Yí does not tell you the meal will come; it asks what you are choosing to hunger for.

When there is something in your own life you suspect you have been feeding without meaning to — a habit, a worry, a relationship you keep spooning attention into — bring it to the Six Doors and see what the mouth answers.