Speculative reason could only exhibit this concept (of freedom)
problematically as not impossible to thought, without assuring it
any objective reality, and merely lest the supposed impossibility of
what it must at least allow to be thinkable should endanger its very
being and plunge it into an abyss of scepticism.
Inasmuch as the reality of the concept of freedom is proved by an
apodeictic law of practical reason, it is the keystone of the whole
system of pure reason, even the speculative, and all other concepts
(those of God and immortality) which, as being mere ideas, remain in
it unsupported, now attach themselves to this concept, and by it
obtain consistence and objective reality; that is to say, their
possibility is proved by the fact that freedom actually exists, for
this idea is revealed by the moral law.
Freedom, however, is the only one of all the ideas of the
speculative reason of which we know the possibility a priori (without,
however, understanding it), because it is the condition of the moral
law which we know.
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