T HIS WORK is called the "Critical Examination of Practical Reason," not of the pure practical reason, although its parallelism with the speculative critique would seem to require the latter term. The reason of this appears sufficiently from the treatise itself. Its business is to show that there is pure practical reason, and for this purpose it criticises the entire practical faculty of reason. If it succeeds in this it has no need to criticise the pure faculty itself in order to see whether reason in making such a claim does not presumptuously overstep itself (as is the case with the speculative reason). For if, as pure reason, it is actually practical, it proves its own reality and that of its concepts by fact, and all disputation against the possibility of its being real is futile.
With this faculty, transcendental freedom is also established; freedom, namely, in that absolute sense in which speculative reason required it in its use of the concept of causality in order to escape the antinomy into which it inevitably falls, when in the chain of cause and effect it tries to think the unconditioned. 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 (106)
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Publication information: Book title: Kant's Critique of Practical Reason and Other Works on the Theory of Ethics. Edition: 3rd Rev.. Contributors: Thomas Kingsmill Abbott - Translator, Immanuel Kant - Author. Publisher: Longmans, Green. Place of publication: London. Publication year: 1883. Page number: 87.
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