The 14th-century historian Ibn Khaldun, writing in the Maghreb, named 'asabiyya' — group cohesion or social solidarity — as the variable that explained the rise and fall of dynasties. A founder generation builds through shared struggle; their children consolidate and codify; their grandchildren inherit comfort and lose the cohesion that made the building possible. Decline follows on schedule, regardless of the dynasty.
The principle: Cohesion is not a stable state — it has a lifecycle. The first generation builds it through shared struggle; the second consolidates and codifies; the third inherits the comfort but not the practice that produced it. Most institutions die on this cycle. Naming it is the first step to escaping it; designing for periodic re-founding (rituals, hardship, new struggle) is the practical move.