A source-first reading note for Hexagram 16, Yu (Enthusiasm), with a reference translation, trigram frame, and one reversible observation practice.
Reference translation
YU, Enthusiasm: it is favorable to install feudal lords and to set armies marching. The Tuan says: In Yu, the firm finds response, and its will is carried out; there is movement in accord with devotion — this is Yu. Because Yu moves in accord with devotion, even heaven and earth follow it; how much more, then, the installing of princes and the marching of armies! Heaven and earth move with devotion, and thus sun and moon do not stray, and the four seasons do not err. The sage moves with devotion, and so punishments are pure and the people submit. Great indeed is the meaning of the time of Yu!
See the original-text and authority layers in the complete catalog entry.
Context from the authority layer
The Erya states: "Yu means peace and joy." The Book of Songs, Xiaoya, Baiju says: "You dukes and you lords, your ease and joy know no end." Yu thus means joy. Some Yijing scholars cite the Zhongyong's saying, "In all things, preparation brings success; without preparation, there is failure," interpreting yu as "preparation," but this meaning does not accord with the hexagram's imagery.
Read the structure before the slogan
The lower trigram is 坤 (地), associated in the bundled corpus with 顺; the upper trigram is 震 (雷), associated with 动. Read the lower trigram as the inner or starting field and the upper trigram as the outward field before turning the pattern into advice.
One accountable observation practice
Copy one concrete verb, condition, or image from the reference translation for Hexagram 16. Name one place where it is observable in the situation you are examining. Then choose one small step you can reverse and write the condition that would make you review it.
Common misread to avoid
Do not turn Enthusiasm into a personality label, a guaranteed event, or a verdict about another person. The translation and trigram frame are source layers to examine, not an instruction to surrender judgment.
Source boundary
The reference translation and context are drawn from Yarrow's bundled structured Zhouyi authority layer. Yarrow keeps that layer separate from optional modern reflection. This page does not claim that Hexagram 16 was cast for your question.