豫 → 隨
Hexagram 16: Enthusiasm → Hexagram 17: Following
Changing Lines
This transformation involves 2 changing lines (lines 1, 5).
Line 1
初六 鳴豫。凶。
Six at the beginning means: Enthusiasm that expresses itself Brings misfortune.
Line 5
六五 貞疾。恆不死。
Six in the fifth place means: Persistently ill, and still does not die.
Trigram Changes
Yilin Verse
憂在腹內，山崩為疾；禍起蕭墻，竟制其國。
Worry lies within; the mountain collapses into sickness. Disaster rises from inside the walls, and in the end overwhelms the state.
— Jiao Yanshou, Yilin (Forest of Changes), 1st century BCE
Commentary
Thunder shakes the earth, but the trouble festers within. Sickness lurks inside the belly; a mountain collapses as disease takes hold. Disaster arises from within the inner walls — the phrase 'trouble at the screen wall' (禍起蕭牆) quotes Confucius's warning from the Analerta about the Ji clan's designs on Zhuanyu: 'I fear the trouble lies not in Zhuanyu but within the screen wall itself.' The internal threat ultimately seizes control of the state. From Enthusiasm to Following, the pattern fits: thunder rests within the lake, waiting. Following requires yielding to what comes, but when what comes is internal decay, following the wrong impulse leads to the state's undoing.
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