Lake resting on lake, each replenishing the other: Duì is the joyous — gladness grounded in inner firmness, the strength that shows itself as gentleness and friendliness.
Its sociology is the two lakes: joy is replenished by exchange — friends in discussion and practice, gladness shared and thereby doubled. Its discernment lists the counterfeits: joy imported from outside, joy bargained over, joy seduced by whatever passes. True joyousness rests on something within that circumstance cannot repossess.
問Duì is warmth itself in love: shared delight, easy laughter, the friendship at a romance's core. Its standard is contented joy — complete in itself, asking nothing of circumstance — over the hungry kind that needs constant feeding from outside. Encourage one another, the two lakes' way; and stay honest about the fifth line: warmth extended toward what is disintegrating deserves clear eyes.
Professionally, Duì governs morale and the cultures that learn: teams where discussion and practice replenish everyone, where firmness inside wears friendliness outside. Joy is a working asset — people persevere toward what gladdens them. Guard it from the counterfeits: perks as bargained joy, hype as seduced joy. The genuine article rests on work worth doing, shared.
Inwardly, Duì locates joy's spring: inside, fed by truth and companionship, not imported from possessions or applause. Its practice is the joseki of the two lakes — find the friends with whom understanding is exchanged and practiced, and let gladness circulate. Weighed, bargained, or borrowed joy exhausts; the contented kind renews itself overnight.
A line speaks only when it is a changing line in your own casting.