16. 
Yü
     
 Enthusiasm.

Upper Trigram: Chen; Thunderclap, Movement.
Lower Trigram: K'un; Passive Principle, Earth.

Governing Rulers: Nine in the fourth place.
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The Image:
The trigrams for the earth and thunder issuing from it with its crashing noise; these form Yü.
The ancient kings, in accordance with this, composed their music and did honour to virtue, presenting it especially and most grandly to God, when they associated with Him their highest ancestor and their father.
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Miscellaneous Signs:                                             (15)
Yü, forsaking others, accomplishes obtuseness.
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The Judgement:
Yü indicates that, in the state which it implies, feudal princes may be set up, and armies put in motion, with advantage.
See also Ta Chuan, section II, chapter II, §8.

Commentary:
In Yü we see the strong line responded to by all the others, and the will of him whom it represents carried out; and also docile obedience employing movement for its purposes. From these comes Yü, the condition of harmony and satisfaction.
In this condition we have docile obedience employing movement for its purposes, and therefore it is so as between heaven and earth.
How much more will it be so among men in 'the setting up of feudal princes and putting armies in motion!'
Heaven and earth show that docile obedience in connexion with movement, and hence the sun and moon make no error in time, and the four seasons do not deviate from their order.
The sages show such docile obedience in connexion with their movements, and hence their punishments and penalties are entirely just, and the people acknowledge it by their submission.
Great indeed are the time and significance indicated in Yü!
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The Lines:

Six in the bottom place:
Showing its subject proclaiming his pleasure and satisfaction. There will be evil.
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Six in the second place:
This line shows one who is firm as a rock. He sees a thing without waiting till it has come to pass; with firm correctness there will be good fortune.
See also Ta Chuan, section II, chapter V, §11.
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Six in the third place:
We see one who is looking up for favours, while indulging in feelings of pleasure and satisfaction. If he would understand!...
If he be late in doing so, there will be occasion for repentance.
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Nine in the fourth place:
 O
Showing him from whom the harmony and satisfaction come. Great is the success which he obtains. Let him not allow suspicions to enter his mind, and friends will gather around him.
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Six in the fifth place:
Showing one with a chronic complaint, but who lives on without dying.
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Top-most six:
Showing its subject with a darkened mind, devoted to the pleasure and satisfaction of the time; but if he change his course, even when it may be considered completed, there will be no error.
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Commentaries:

Six in the bottom place:
'He proclaims his pleasure and satisfaction; there will be evil': his wishes have been satisfied to weaken his will.
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Six in the second place:
'He sees a thing without waiting till it has come to pass; with firm correctness there will be good fortune': this is shown by the correct and central position of the line.
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Six in the third place:
'He is looking up for favours, while indulging in feelings of pleasure and satisfaction; there will be occasion for repentance': this is intimated by the position not being the appropriate one.
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Nine in the fourth place:
'From him the harmony and satisfaction come; great is the success which he obtains': his aims take effect on a grand scale.
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Six in the fifth place:
'He has a chronic complaint': this is shown by his being mounted on the strong line.
'He lives on without dying': he is in the central position and has not yet perished.
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Top-most six:
'With a darkened mind, devoted to the pleasure and satisfaction of the time': how can one in such a condition continue long?
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