雷出地奮，豫。 先王以作樂崇德， 殷薦之上帝， 以配祖考。
Thunder breaks out above the earth with a boom: Enthusiasm. Ancient rulers used music to praise virtuous accomplishments. They made grand offerings to the Supreme Being to be accompanied by their ancestors.
Enthusiasm: Beneficial to build up helpers & move the multitude.
Deluded enthusiasm. If after completion one changes, no blame.
Long illness, but still alive.
From enthusiasm, great gain. Companions gather.
To gaze & repose brings regret. Late action brings regret.
Firm & stable like a rock. Do not wait a whole day. Continuing: good fortune.
Enthusiasm that shows itself off: misfortune.