But when this acute
people had advanced so far in their investigations of nature as to
treat even moral questions philosophically, on which other nations had
never done anything but talk, then first they found a new and
practical want, which did not fail to give definiteness to their
conception of the First Being: and in this the speculative reason
played the part of spectator, or at best had the merit of embellishing
a conception that had not grown on its own ground, and of applying a
series of confirmations from the study of nature now brought forward
for the first time, not indeed to strengthen the authority of this
conception (which was already established), but rather to make a
show with a supposed discovery of theoretical reason.
From these remarks, the reader of the Critique of Pure Speculative
Reason will be thoroughly convinced how highly necessary that
laborious deduction of the categories was, and how fruitful for
theology and morals. For if, on the one hand, we place them in pure
understanding, it is by this deduction alone that we can be
prevented from regarding them, with Plato, as innate, and founding
on them extravagant pretensions to theories of the supersensible, to
which we can see no end, and by which we should make theology a
magic lantern of chimeras; on the other hand, if we regard them as
acquired, this deduction saves us from restricting, with Epicurus, all
and every use of them, even for practical purposes, to the objects and
motives of the senses.
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