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Page 34
In order indeed that a rational being who is also affected through
the senses should will what reason alone directs such beings that they
ought to will, it is no doubt requisite that reason should have a
power to infuse a feeling of pleasure or satisfaction in the
fulfilment of duty, that is to say, that it should have a causality by
which it determines the sensibility according to its own principles.
But it is quite impossible to discern, i.e., to make it intelligible a
priori, how a mere thought, which itself contains nothing sensible,
can itself produce a sensation of pleasure or pain; for this is a
particular kind of causality of which as of every other causality we
can determine nothing whatever a priori; we must only consult
experience about it. But as this cannot supply us with any relation of
cause and effect except between two objects of experience, whereas
in this case, although indeed the effect produced lies within
experience, yet the cause is supposed to be pure reason acting through
mere ideas which offer no object to experience, it follows that for us
men it is quite impossible to explain how and why the universality
of the maxim as a law, that is, morality, interests. This only is
certain, that it is not because it interests us that it has validity
for us (for that would be heteronomy and dependence of practical
reason on sensibility, namely, on a feeling as its principle, in which
case it could never give moral laws), but that it interests us because
it is valid for us as men, inasmuch as it had its source in our will
as intelligences, in other words, in our proper self, and what belongs
to mere appearance is necessarily subordinated by reason to the nature
of the thing in itself.
The question then, "How a categorical imperative is possible," can
be answered to this extent, that we can assign the only hypothesis
on which it is possible, namely, the idea of freedom; and we can
also discern the necessity of this hypothesis, and this is
sufficient for the practical exercise of reason, that is, for the
conviction of the validity of this imperative, and hence of the
moral law; but how this hypothesis itself is possible can never be
discerned by any human reason. On the hypothesis, however, that the
will of an intelligence is free, its autonomy, as the essential formal
condition of its determination, is a necessary consequence.
Moreover, this freedom of will is not merely quite possible as a
hypothesis (not involving any contradiction to the principle of
physical necessity in the connexion of the phenomena of the sensible
world) as speculative philosophy can show: but further, a rational
being who is conscious of causality through reason, that is to say, of
a will (distinct from desires), must of necessity make it practically,
that is, in idea, the condition of all his voluntary actions. But to
explain how pure reason can be of itself practical without the aid
of any spring of action that could be derived from any other source,
i.e., how the mere principle of the universal validity of all its
maxims as laws (which would certainly be the form of a pure
practical reason) can of itself supply a spring, without any matter
(object) of the will in which one could antecedently take any
interest; and how it can produce an interest which would be called
purely moral; or in other words, how pure reason can be practical-
to explain this is beyond the power of human reason, and all the
labour and pains of seeking an explanation of it are lost.
It is just the same as if I sought to find out how freedom itself is
possible as the causality of a will. For then I quit the ground of
philosophical explanation, and I have no other to go upon. I might
indeed revel in the world of intelligences which still remains to
me, but although I have an idea of it which is well founded, yet I
have not the least knowledge of it, nor an I ever attain to such
knowledge with all the efforts of my natural faculty of reason. It
signifies only a something that remains over when I have eliminated
everything belonging to the world of sense from the actuating
principles of my will, serving merely to keep in bounds the
principle of motives taken from the field of sensibility; fixing its
limits and showing that it does not contain all in all within
itself, but that there is more beyond it; but this something more I
know no further. Of pure reason which frames this ideal, there remains
after the abstraction of all matter, i.e., knowledge of objects,
nothing but the form, namely, the practical law of the universality of
the maxims, and in conformity with this conception of reason in
reference to a pure world of understanding as a possible efficient
cause, that is a cause determining the will. There must here be a
total absence of springs; unless this idea of an intelligible world is
itself the spring, or that in which reason primarily takes an
interest; but to make this intelligible is precisely the problem
that we cannot solve.
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