The philosopher, however, has greater difficulties to
contend with here (as always in rational cognition by means of
concepts merely without construction), because he cannot take any
intuition as a foundation (for a pure noumenon). He has, however, this
advantage that, like the chemist, he can at any time make an
experiment with every man's practical reason for the purpose of
distinguishing the moral (pure) principle of determination from the
empirical; namely, by adding the moral law (as a determining
principle) to the empirically affected will (e.g., that of the man who
would be ready to lie because he can gain something thereby). It is as
if the analyst added alkali to a solution of lime in hydrochloric
acid, the acid at once forsakes the lime, combines with the alkali,
and the lime is precipitated. just in the same way, if to a man who is
otherwise honest (or who for this occasion places himself only in
thought in the position of an honest man), we present the moral law by
which he recognises the worthlessness of the liar, his practical
reason (in forming a judgement of what ought to be done) at once
forsakes the advantage, combines with that which maintains in him
respect for his own person (truthfulness), and the advantage after
it has been separated and washed from every particle of reason
(which is altogether on the side of duty) is easily weighed by
everyone, so that it can enter into combination with reason in other
cases, only not where it could be opposed to the moral law, which
reason never forsakes, but most closely unites itself with.
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