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This fragment separates hard labor from evil, then leaves obedience itself hanging as the more troubling condition.

Its force comes from where it stops. Shoveling coal is cleared of demonic meaning, but "taking any kind of order" is left unresolved, as if the moral danger begins exactly where labor turns into submission.

Two lines: I knew shoveling coal was not the devil / And I knew that taking any kind of order was. The stripped-down thesis.