The real turning point between morality and simple expediency is

contained in the penal sanction
The real turning point between morality and simple expediency is
contained in the penal sanction. Duty is what we may _exact_ of a
person; there may be reasons why we do not exact it, but the person
himself would not be entitled to complain if we did so. Expediency, on
the other hand, points to things that we may wish people to do, may
praise them for doing, and despise them for not doing, while we do not
consider it proper to bring in the aid of punishment.


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