He who has been able to convince himself of the truth of the
positions occurring in the Analytic will take pleasure in such
comparisons; for they justly suggest the expectation that we may
perhaps some day be able to discern the unity of the whole faculty
of reason (theoretical as well as practical) and be able to derive all
from one principle, which, is what human reason inevitably demands, as
it finds complete satisfaction only in a perfectly systematic unity of
its knowledge.
{BOOK_1|CHAPTER_3 ^paragraph 40}
If now we consider also the contents of the knowledge that we can
have of a pure practical reason, and by means of it, as shown by the
Analytic, we find, along with a remarkable analogy between it and
the theoretical, no less remarkable differences. As regards the
theoretical, the faculty of a pure rational cognition a priori could
be easily and evidently proved by examples from sciences (in which, as
they put their principles to the test in so many ways by methodical
use, there is not so much reason as in common knowledge to fear a
secret mixture of empirical principles of cognition).
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