Some years ago, a very wise gentleman told me of a saying that succinctly describes the decline and fall of family fortunes, which happens to cycle in approximately four generations. “Khattu, Nikhattu, Udharichand, Baychumal”.
It begins with the generation that works hard (Khattu) and builds up the family fortune. It is followed by a generation that is lazy (Nikhattu) and lives off the wealth. The third generation becomes more lazy and lives off borrowings (Udharichand) against the remaining assets. Finally, the fourth generation ends up selling the assets and ends up poor.
A version of this cycle must apply at larger scales too, that of societies and nations. It could be a global phenomenon and if so, other societies must have recognized the phenomenon and therefore also have similar sayings. And indeed they do. Here are a few from around the world. I got them off the web.