"Proof that a given condition always precedes or accompanies a phenomenon does not warrant concluding with certainty that a given condition is the immediate cause of that phenomenon. It must still be established that when this condition is removed, the phenomen will no longer appear."

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In a society of little economic development, universal inactivity accompanies universal poverty. You survive not by struggling against nature, or by increasing production, or by relentless labor; instead you survive by expending as little energy as possible, by striving constantly to achieve a state of immobility.

— Ryszard Kapuscinski