頤 → 屯
第27卦 頤 (Nourishment) 变 第3卦 屯 (Difficulty at the Beginning)
䷚
頤
Nourishment
Mountain / Thunder
→
䷂
屯
Difficulty at the Beginning
Water / Thunder
变爻不变爻
变爻
此变化涉及 2 个变爻（第 5、6 爻）。
第五爻
六五 拂經。居貞吉。不可涉大川。
拂fúdismissing
经jīngthe norms
居jūto practice
贞zhēnpersistence
吉jíis promising
不bùbut one is not
可kěsuited
涉shèto
大dàthe great
川chuānstream
Six in the fifth place means: Turning away from the path. To remain persevering brings good fortune. One should not cross the great water.
第上爻
上九 由頤。厲吉。利涉大川。
由yóuat
颐yíthe appetites
厉lìdistress
吉jíbut promising
利lìit is worthwhile
涉shèto cross
大dàthe great
川chuānstream
Nine at the top means: The source of nourishment. Awareness of danger brings good fortune. It furthers one to cross the great water.
卦象变化
上卦Mountain → WaterKeeping Still → The Deep
下卦Thunder → Thunder
焦氏易林
三雁俱行，避暑就涼。適與矰遇，為繳所傷。
Three geese travel together, fleeing heat to seek the cool. They chance upon a stringed arrow; wounded by the tethered shaft.
— 焦延寿《焦氏易林》，公元前一世纪
注释
山下有雷，頤養之靜。三雁結伴而行，避暑就涼，本為求養之舉。然途中遭遇繳矢，中箭受傷。繳為繫繩之箭，射鳥而不失矢，使遷徙之途成為陷阱。此象精確：求食者於開闊處暴露自身。從頤至屯（雲雷初動），養之平靜化為初始之險：此季之養於彼季反為禍端，趨利之途正是危機潛伏之所。轉變本身即是風險。
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