Dui is the hexagram of joy. Lake doubled upon lake is the image of two bodies of water feeding each other — and that mutual giving is the book's root of joy. Dui is also the trigram of the mouth and of speech, so the hexagram joins two ideas: joy comes from openness, and openness comes from honest exchange. The judgment is short and warm: "success; perseverance is favorable."
In career and enterprise, Dui describes the pleasure of shared work — the satisfaction that comes when people exchange freely, learn from each other, and build together. The image of two lakes nourishing one another is the book's model of a healthy team or partnership: each gives, each receives, and the water stays fresh. The counsel is to keep the exchange honest and open, because joy that is traded beats joy that is hoarded.
In relationships, Dui is the hexagram of delight — but it reads delight with a careful eye. Its lines sort true joy from its counterfeits: contented joy (line 1), sincere joy (line 2), and the "coming joy" that is really flattery (line 3). Line 4's weighed joy that is "not at peace" and line 6's "seductive joyousness" are the warnings: pleasure that pleases only the surface cannot be trusted. Real joy, the hexagram says, is sincere and shared.
For timing, Dui marks an open, sociable phase, good for connection, collaboration, and celebration. The counsel is to enjoy it — the hexagram's judgment is genuinely favorable — while keeping the joy sincere. What this phase does not reward is forced gaiety or the seductive kind that hides a cost.
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Cast the I Ching Oracle → Free · No sign-up · 3,000-year-old methodSource: Judgment and line texts follow the Wilhelm/Baynes rendering of the Yijing used across energyyi.com (Wilhelm's original German, 1924, is in the public domain).