first place and constitutes the condition of all the rest. In order to
do this, we will take the notion of duty, which includes that of a
good will, although implying certain subjective restrictions and
hindrances. These, however, far from concealing it, or rendering it
unrecognizable, rather bring it out by contrast and make it shine
forth so much the brighter.

I omit here all actions which are already recognized as inconsistent
with duty, although they may be useful for this or that purpose, for
with these the question whether they are done from duty cannot arise
at all, since they even conflict with it. I also set aside those
actions which really conform to duty, but to which men have no
direct inclination, performing them because they are impelled
thereto by some other inclination. For in this case we can readily
distinguish whether the action which agrees with duty is done from
duty, or from a selfish view. It is much harder to make this
distinction when the action accords with duty and the subject has
besides a direct inclination to it. For example, it is always a matter
of duty that a dealer should not over charge an inexperienced
purchaser; and wherever there is much commerce the prudent tradesman
does not overcharge, but keeps a fixed price for everyone, so that a
child buys of him as well as any other. Men are thus honestly
served; but this is not enough to make us believe that the tradesman
has so acted from duty and from principles of honesty: his own
advantage required it; it is out of the question in this case to
suppose that he might besides have a direct inclination in favour of
the buyers, so that, as it were, from love he should give no advantage
to one over another. Accordingly the action was done neither from duty
nor from direct inclination, but merely with a selfish view.