Skillful vs Unskillful

As a loose guideline ask whether an action increases or decreases the suffering in the world?

Decreasing suffering = skillful, increasing suffering^* = unskillful.

It's never that simple but it's a decent guideline.

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^* I know someone will think, “but those people are bad and they need to suffer”. This is dumb monkey thinking. Those people are not bad, though they have done something bad (unskillful). They don't need to suffer, they need to stop doing unskillful things.