It is
absolutely impossible, however, to know the existence of this Being
from mere concepts, because every existential proposition, that is,
every proposition that affirms the existence of a being of which I
frame a concept, is a synthetic proposition, that is, one by which I
go beyond that conception and affirm of it more than was thought in
the conception itself; namely, that this concept in the
understanding has an object corresponding to it outside the
understanding, and this it is obviously impossible to elicit by any
reasoning. There remains, therefore, only one single process
possible for reason to attain this knowledge, namely, to start from
the supreme principle of its pure practical use (which in every case
is directed simply to the existence of something as a consequence of
reason) and thus determine its object. Then its inevitable problem,
namely, the necessary direction of the will to the summum bonum,
discovers to us not only the necessity of assuming such a First
Being in reference to the possibility of this good in the world,
but, what is most remarkable, something which reason in its progress
on the path of physical nature altogether failed to find, namely, an
accurately defined conception of this First Being.
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