I focus on two main points in Ian Proops’s reading of Kant’s Paralogisms of Pure Reason: the structure of the paralogisms in the A edition of the Critique of Pure Reason, and the changes in Kant’s exposition of the paralogisms from A to B. I agree with Proops that there are defects in the A exposition and that Kant attempted to correct those defects in B. But I argue that Proops fails to give its due to what remains fundamental in both editions: Kant’s criticism of the rational psychologist’s confusion between the subjective (albeit universally subjective) standpoint thinkers have on themselves just in virtue of thinking, and the objective, metaphysical standpoint on a thinking thing. In short, Proops fails to give sufficient attention to Kant’s opening statement in the Paralogisms of Pure Reason: ‘“I think” is the sole text of rational psychology’.

My comments focus on Proops’s treatment of the Paralogisms. I agree with many aspects of his discussion, including his views about the project of Rational Psychology and his analyses of how, exactly, the arguments of the Paralogisms are defective in form, but I disagree with his interpretation of the First Paralogism. I argue that the source of confusion that Kant diagnoses is not the grammatical distribution of ‘I’ as singular, but the fact that the I-representation is both empty and necessary for cognition.

I raise three questions relevant to De Boer’s overall project in Kant’s Reform of Metaphysics. The first is whether Kant’s 1799 open letter to Fichte supports or threatens her contention that Kant had an abiding interest in developing a reformed metaphysics from 1781 onwards. The second is whether De Boer’s conception of the pure intellect and its place in Kant’s projected system of metaphysics captures the role of pure sensibility in the Analytic of Principles, rational physics and rational psychology. The third is whether one might accept the outline of this system as De Boer develops it while still holding that it is more accurate to characterize it as revolution rather than reform.