(The former would rest on
morality as the supreme principle, the latter on happiness.) Since,
however, the world of understanding contains the foundation of the
world of sense, and consequently of its laws also, and accordingly
gives the law to my will (which belongs wholly to the world of
understanding) directly, and must be conceived as doing so, it follows
that, although on the one side I must regard myself as a being
belonging to the world of sense, yet on the other side I must
recognize myself as subject as an intelligence to the law of the world
of understanding, i.e., to reason, which contains this law in the idea
of freedom, and therefore as subject to the autonomy of the will:
consequently I must regard the laws of the world of understanding as
imperatives for me and the actions which conform to them as duties.
And thus what makes categorical imperatives possible is this, that
the idea of freedom makes me a member of an intelligible world, in
consequence of which, if I were nothing else, all my actions would
always conform to the autonomy of the will; but as I at the same
time intuite myself as a member of the world of sense, they ought so
to conform, and this categorical "ought" implies a synthetic a
priori proposition, inasmuch as besides my will as affected by
sensible desires there is added further the idea of the same will
but as belonging to the world of the understanding, pure and practical
of itself, which contains the supreme condition according to reason of
the former will; precisely as to the intuitions of sense there are
added concepts of the understanding which of themselves signify
nothing but regular form in general and in this way synthetic a priori
propositions become possible, on which all knowledge of physical
nature rests.
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