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From some of your other comments, I suspect your definition of "weak" just makes this a tautology. 
I mean, sure, if you define "strong" as "People who aren’t concerned with material consumption or pleasure.", then people who are concerned with material consumption and/or pleasure are "weak", and societies that are concerned with that are "weak". 
But that's not really a definition that anyone uses. I defy you to find a single dictionary with a single definition of "weak" (or "strong") that is even remotely similar to that.
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