In this way it can be understood why in the whole
faculty of reason it is the practical reason only that can help us
to pass beyond the world of sense and give us knowledge of a
supersensible order and connection, which, however, for this very
reason cannot be extended further than is necessary for pure practical
purposes.
Let me be permitted on this occasion to make one more remark,
namely, that every step that we make with pure reason, even in the
practical sphere where no attention is paid to subtle speculation,
nevertheless accords with all the material points of the Critique of
the Theoretical Reason as closely and directly as if each step had
been thought out with deliberate purpose to establish this
confirmation. Such a thorough agreement, wholly unsought for and quite
obvious (as anyone can convince himself, if he will only carry moral
inquiries up to their principles), between the most important
proposition of practical reason and the often seemingly too subtle and
needless remarks of the Critique of the Speculative Reason,
occasions surprise and astonishment, and confirms the maxim already
recognized and praised by others, namely, that in every scientific
inquiry we should pursue our way steadily with all possible
exactness and frankness, without caring for any objections that may be
raised from outside its sphere, but, as far as we can, to carry out
our inquiry truthfully and completely by itself.
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