豫 → 師
Hexagram 16: Enthusiasm → Hexagram 7: The Army
Changing Lines
This transformation involves 2 changing lines (lines 2, 4).
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.
Trigram Changes
Yilin Verse
蝗囓我稻，驅不可去；實穗無有，但見空藁。
Locusts gnaw our rice; drive them off, they will not go. Full ears are no more -- only empty stalks remain.
— Jiao Yanshou, Yilin (Forest of Changes), 1st century BCE
Commentary
Thunder surges from the earth, yet what emerges is not celebration but catastrophe. Locusts gnaw the rice stalks and cannot be driven away; the grain heads stand empty, nothing left but hollow straw. The image is total agricultural devastation — a swarm that consumes everything and yields to no human effort. From Enthusiasm to The Army, the transformation captures the shift from joyful abundance to disciplined crisis response. The Army's image is water stored within the earth: resources hidden and marshaled beneath the surface. When the harvest is devoured, what remains is the need for organized, collective action — the army that mobilizes not for glory but for survival against an overwhelming natural enemy.
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