[simiones]

I've usually seen this quote as a meme applied to military power, usually accompanied by imagery of roman legionnaires or such. As far as I understand, the original quote is coming from a post-apocalyptic novel, so I doubt the context is supposed to be everyday life.

Even so, regardless of other context, the general reality is that wealth and power beget wealth and power. Poor people (or societies) have a much much smaller chance of becoming wealthy than people who start wealthy have of maintaining their wealth.

I would agree that it those extraordinarily few people who manage to ascend the social latter are probably universally very strong people. But there are many times more people who could be considered weak that nevertheless preserve their wealth and status than there are strong people who improve their own. This applies both at an individual level as well as a group and societal level.