豫 → 蒙
Hexagram 16: Enthusiasm → Hexagram 4: Youthful Folly
Changing Lines
This transformation involves 3 changing lines (lines 2, 4, 6).
Line 2
六二 介于石。不終日。貞吉。
Six in the second place means: Firm as a rock. Not a whole day. Perseverance brings good fortune.
Line 4
九四 由豫。大有得。勿疑。朋盍簪。
Nine in the fourth place means: The source of enthusiasm. He achieves great things. Doubt not. You gather friends around you As a hair clasp gathers the hair.
Line 6
上六 冥豫。成有渝。无咎。
Six at the top means: Deluded enthusiasm. But if after completion one changes, There is no blame.
Trigram Changes
Yilin Verse
典冊法書，藏在蘭臺；雖遭亂潰，獨不遇災。
An old well sealed with moss, but the stele inscription endures. A child who cannot read it makes a rubbing — and so it is passed down.
— Jiao Yanshou, Yilin (Forest of Changes), 1st century BCE
Commentary
Thunder stirs the earth, but this verse speaks of preservation through chaos. The original reads: 'Canonical books and legal texts are stored in the Orchid Terrace archives; though disorder and collapse rage around them, they alone escape disaster.' The Lantai (蘭臺) was the Han imperial library, repository of the realm's accumulated wisdom. Even as the world crumbles, the written record endures unscathed. From Enthusiasm to Youthful Folly, the transformation moves from exuberant action to the mountain spring's quiet emergence: what springs forth from beneath the mountain is not raw energy but the slow seep of knowledge waiting to be discovered. The archives survive not through force but through the sheer persistence of what is written down.
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