Immanuel Kant
Dialectical inferences of pure reason

In the second of the two Books of "The Transcendental Dialectic", Kant undertakes to demonstrate the contradictory nature of unbounded reason. He does this by developing contradictions in each of the three metaphysical disciplines that he contends are in fact pseudosciences. This section of the Critique is long and Kant's arguments are extremely detailed. In this context, it not possible to do much more than enumerate the topics of discussion. The first chapter addresses what Kant terms the paralogisms — i.e., false inferences — that pure reason makes in the metaphysical discipline of rational psychology. He argues that one cannot take the mere thought of "I" in the proposition "I think" as the proper cognition of "I" as an object. In this way, he claims to debunk various metaphysical theses about the substantiality, unity, and self-identity of the soul. The second chapter, which is the longest, takes up the topic Kant calls the antinomies of pure reason — that is, the contradictions of reason with itself — in the metaphysical discipline of rational cosmology. Originally, Kant had thought that all transcendental illusion could be analyzed in antinomic terms. He presents four cases in which he claims reason is able to prove opposing theses with equal plausibility:

Kant further argues in each case that his doctrine of transcendental idealism is able to resolve the antinomy. The third chapter examines fallacious arguments about God in rational theology under the heading of the "Ideal of Pure Reason". (Whereas an idea is a pure concept generated by reason, an ideal is the concept of an idea as an individual thing.) Here Kant addresses and claims to refute three traditional arguments for the existence of God: the ontological argument, the cosmological argument, and the physio-theological argument (i.e., the argument from design). The results of the transcendental dialectic so far appear to be entirely negative. In an Appendix to this section, Kant rejects such a conclusion. The ideas of pure reason, he argues, have an important regulatory function in directing and organizing our theoretical and practical inquiry. Kant's later works elaborate upon this function at length and in detail.
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