Thus, when practical reason cultivates itself, there insensibly arises
in it a dialetic which forces it to seek aid in philosophy, just as
happens to it in its theoretic use; and in this case, therefore, as
well as in the other, it will find rest nowhere but in a thorough
critical examination of our reason.
SECOND SECTION
TRANSITION FROM POPULAR MORAL PHILOSOPHY
TO THE METAPHYSIC OF MORALS
If we have hitherto drawn our notion of duty from the common use
of our practical reason, it is by no means to be inferred that we have
treated it as an empirical notion. On the contrary, if we attend to
the experience of men's conduct, we meet frequent and, as we ourselves
allow, just complaints that one cannot find a single certain example
of the disposition to act from pure duty. Although many things are
done in conformity with what duty prescribes, it is nevertheless
always doubtful whether they are done strictly from duty, so as to
have a moral worth. Hence there have at all times been philosophers
who have altogether denied that this disposition actually exists at
all in human actions, and have ascribed everything to a more or less
refined self-love.
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