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  • Kant’s Idealism by Philip J. Neujahr
  • Yolanda Estes
Philip J. Neujahr. Kant’s Idealism. Macon, GA: Mercer University Press, 1995. Pp. viii + 134. Paper, $16.00.

In Kant’s Idealism, Philip Neujahr contends that the Critique of Pure Reason expresses no distinctively “transcendental” form of idealism. Neujahr disagrees with commentators, such as H. J. Paton and Henry Allison, who attempt to show that the Kantian project is in essence a coherent and tenable one. He agrees with commentators, such as Norman Kemp Smith and P. F. Strawson, who argue that the various facets of Kant’s philosophy do not constitute a coherent whole. Moreover, he suggests that the tensions in Kant’s philosophy betray more serious, deep-rooted contradictions than have been previously imagined by the least generous interpreters.

Neujahr maintains Kant’s theoretical philosophy contains disparate threads of idealism, which remain closely tied to the idealistic tradition preceding it, but which present no single idealist doctrine, because Kant provided neither a unified account of the nature of the cognitive subject nor a single theory of the subject’s relation to the object of knowledge. The description of the cognitive subject given in the Critique permits several readings. One might assume that the cognitive subject represents the individual human being. According to Neujahr, this interpretation yields a monadistic view of the subject, similar to Leibniz’s, which allows for no interaction between individual minds within a public, spatio-temporal world. Alternatively, one might imagine a universal mind, something akin to Berkeley’s God or Hegel’s Spirit, which is not equivalent to the individual human subject. This interpretation avoids some complications associated with the first view, but it makes it difficult to specify the relation between the cosmic mind and the phenomenal individual or to account for our a priori knowledge of the subjective contribution to experience.

Unresolved tensions between the doctrines of sensibility and understanding generate ambiguities in Kant’s overall account of consciousness, including his explanation of the status of the subject and object of experience. Neujahr suggests that the Transcendental Aesthetic presupposes a “correspondence” theory of consciousness, whereas the Transcendental Deduction contains a “coherence” theory of consciousness. According to Neujahr’s interpretation of the doctrine of sensibility, consciousness involves a relation between an ontologically distinct subject and object. On this reading, the status of the object seems ambiguous, and thus the phenomenal world remains in some sense “unreal” in contrast to the thing in itself. Neujahr believes the doctrine of understanding avoids these difficulties by eliminating the thing in itself and redefining “reality” in [End Page 143] terms of those features about the world that make it knowable, but he doubts the possibility of reconciling this approach with the Transcendental Aesthetic. Kant’s distinction between the empirical and transcendental points of view is often seen as a way of entering and understanding his philosophy, but Neujahr argues that Kant’s use of this terminology is itself inconsistent and unhelpful without a thoroughgoing revision.

Neujahr contends that Kant attempts to discover the conditions necessary for knowledge, but that he locates the source of these epistemic conditions within the mind and that this “psychologizing” tendency has important ontological implications. Neujahr considers the possibility of salvaging Kant’s philosophy by attempts, such as Allison’s, to give sympathetic epistemological interpretations of transcendental idealism or by efforts, such as Strawson’s, to excise the idealism from the critical philosophy, but he denies that these endeavors can save transcendental idealism without violating the letter of Kant’s philosophy. Moreover, he contends that Kant’s idealism remains vulnerable to skepticism in asmuch as it fails to answer Hume’s doubts about the unity of consciousness and Descartes’s questions about the existence of the external world.

Neujahr’s unsympathetic reading of Kant’s theoretical philosophy may appear unduly harsh to many readers. Many readers will wish for some acknowledgment that the second Critique and the third Critique might mitigate some of the inconsistencies delineated by Neujahr, who provides little elucidation of the first Critique through any texts other than the Inaugural Dissertation and the Prolegomena. Nonetheless, Kant’s Idealism grapples with complex issues in the first Critique and suggests a...

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