So much by way of justification of the proceeding by which, in
this work, the notions and principles of pure speculative reason which
have already undergone their special critical examination are, now and
then, again subjected to examination. This would not in other cases be
in accordance with the systematic process by which a science is
established, since matters which have been decided ought only to be
cited and not again discussed. In this case, however, it was not
only allowable but necessary, because reason is here considered in
transition to a different use of these concepts from what it had
made of them before. Such a transition necessitates a comparison of
the old and the new usage, in order to distinguish well the new path
from the old one and, at the same time, to allow their connection to
be observed. Accordingly considerations of this kind, including
those which are once more directed to the concept of freedom in the
practical use of the pure reason, must not be regarded as an
interpolation serving only to fill up the gaps in the critical
system of speculative reason (for this is for its own purpose
complete), or like the props and buttresses which in a hastily
constructed building are often added afterwards; but as true members
which make the connexion of the system plain, and show us concepts,
here presented as real, which there could only be presented
problematically.
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