Wikipedia:You can't squeeze blood from a turnip

A turnip cannot be coaxed, squeezed, or cajoled into producing blood. All efforts at obtaining blood from this vegetable will be futile.

You can't squeeze blood from a turnip. – Matt (Casey) Jones

If a standard remedy exists for an editor who has done something wrong and the editor shows no sign of regretting the mistake, then go ahead and apply the standard remedy.

Extreme gestures of good faith need not be extended toward an experienced editor who consistently violates fundamental policies and rebuffs appropriate overtures. Some troublesome users do not want to change and the community's energies are limited.

This essay makes no sense, and does not have anything to do with the idiom it uses.

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