"Catholic" versus "Protestant" Ethics, Bryan Caplan | EconLog | Library of Economics and Liberty:
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The "Catholic" approach has extremely high moral standards (e.g. Be celibate; give everything you have to the poor; love everyone), but enforces them loosely.
The "Protestant" approach has moderate moral standards (e.g. Don't commit adultery; prudently give to the deserving poor; don't hate people who've never done you wrong), but enforces them strictly.