Throughout the critical period Kant enigmatically insists that reason is a 'unity', thereby suggesting that both our theoretical and practical endeavors are grounded in one and the same rational capacity.

Kant’s notoriously unclear attempt to defend the regulative principle of systematic unity as the supreme principle of theoretical reason in the Appendix to the Transcendental Dialectic has left its status a source of controversy. According to the dominant interpretation, the principle ought to be understood as a methodologically necessary device for extending our understanding of nature. I argue that this reading is flawed. While it may correctly affirm that the principle is normative in character, it wrongly implies that it binds with mere hypothetical necessity. I offer novel grounds for thinking that if reason’s principle is normative, then it binds agents categorically instead.

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Catherine Elgin proposes a novel principle for identifying epistemic virtue. Based loosely on Kant's Categorical Imperative, it identifies autonomy as our fundamental epistemic responsibility, and defines the epistemic virtues as those traits of character needed to exercise epistemic autonomy. I argue that Elgin's principle fails as a criterion of epistemic virtue because the instrumental conception of autonomy on which it relies leads to an untenable relativism. Despite this, I suggest that autonomy may yet furnish a plausible criterion for epistemic virtue, provided we construe autonomy as Kant does, as grounded in categorical rather than instrumental reason.

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