All these are
hindrances to the practical use of pure reason, so that the removal of
them may certainly be considered an extension of our knowledge in a
practical point of view, without contradicting the admission that
for speculative purposes reason has not in the least gained by this.
Every employment of reason in respect of an object requires pure
concepts of the understanding (categories), without which no object
can be conceived. These can be applied to the theoretical employment
of reason, i.e., to that kind of knowledge, only in case an
intuition (which is always sensible) is taken as a basis, and
therefore merely in order to conceive by means of- them an object of
possible experience. Now here what have to be thought by means of
the categories in order to be known are ideas of reason, which
cannot be given in any experience. Only we are not here concerned with
the theoretical knowledge of the objects of these ideas, but only with
this, whether they have objects at all. This reality is supplied by
pure practical reason, and theoretical reason has nothing further to
do in this but to think those objects by means of categories.
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