Philosophers traditionally interpret Kant as a retributivist, but modern interpreters, with reference to Kant’s theory of justice and problematic passages, instead propose penal theories that mix retributive and deterrent features. Although these mixed penal theories are substantively compelling and capture the Kantian spirit, their dual aspects lead to a justificatory conflict that generates an apparent dilemma. To resolve this dilemma and clear the ground for these mixed theories, I will outline and reinterpret Kant’s penal theory by situating it in his broader moral and political philosophy. This move grounds the followability requirement, which is necessary to resolve the dilemma.

Although maxims are central to Kant’s ethical theory, his account of them remains obscure. We can make progress towards understanding Kantian maxims by examining not only their role as the object of moral judgement but also their connection to freedom of the will and causality. This requires understanding maxims as causal laws that explain the actions that we impute to agents. In this way, they are analogous to causal laws of nature, but they are limited in scope to the agents who are responsible for them. Understanding maxims in this way explains our limited epistemic access to them and helps to clarify Kant’s account of virtue and character as well as how they mediate the relationship between practical and theoretical reason.

It is widely claimed that the second Critique’s argument for the postulate of immortality is relevantly different from the first Critique’s argument for the postulate. It is also widely claimed that after the second Critique, Kant distances himself from its particular version of the argument, and even the postulate altogether. It is the purpose of this article to challenge these claims, arguing instead that (a) there is overwhelming textual evidence showing that Kant did not abandon the postulate; (b) the second Critique does not contain a substantially different argument for the postulate than how it is argued for in the first Critique; and (c) the philosophical objections levied against the second Critique’s argument, including its putative substitution of holiness for virtue, become moot once its argument is better understood.

There are two main meanings in Kant’s concept of moral certainty (moralische Gewissheit, certitudo moralis): first, it applies to the kind of certainty embodied in rational faith in the existence of God and a future life; second, it applies to the conscientiousness (Gewissenhaftigkeit) required of an agent in the practice of moral judgement. Despite the growing attention to Kant’s theory of conscience and his concept of conscientiousness, this article is the first to discuss ‘moral certainty’ as the aim of ‘conscientiousness’ and to highlight the relevance of both notions in regard to moral education and the purposes of Kant’s ethical doctrines of method.

This article offers the first systematic investigation of the linguistic forms in which Kant expresses his transcendental idealism since Gerold Prauss’ seminal book Kant und das Problem der Dinge an sich. It is argued that Prauss’ own argument for the claim that ‘in itself’ is an adverbial expression that standardly modifies verbs of philosophical reflection is flawed and that there is hence very poor exegetical evidence for so-called ‘methodological two-aspect’ interpretations of Kant’s transcendental idealism. A comprehensive investigation of Kant’s adverbial uses of ‘in itself’ rather reveals that there are various groups of verbs that ‘in itself’ modifies, which can more or less all be reduced to a standard use in which ‘in itself’ modifies verbs of predicative being such as the copula. It is also discussed how these findings can be accommodated by the two main alternative kinds of interpretations, that is, two-object and ontological two-aspect interpretations.

On the currently dominant reading of the Groundwork, Kant’s derivation of ‘imperatives of duty’ exemplifies a decision procedure for the derivation of concrete duties in moral deliberation. However, Kant’s response to an often-misidentified criticism of the Groundwork by G. A. Tittel suggests that Kant was remarkably unconcerned with arguing for the practicality of the categorical imperative as a decision procedure. Instead, I argue that the main aim of Kant’s derivation of imperatives of duty was to show how his analysis of the form of moral judgement is indeed presupposed in the four types of moral imperative that philosophers of his time recognized.

In this article, I offer a novel and in-depth account of how, for Kant, free speech is the mechanism that moves a society closer to justice. I argue that the criticism of the legislator preserved by free speech must also be the result of collective agreement. I further argue that structural features of judgements of taste and the sensus communis give guidance for how we should communicate publicly to succeed at the aims Kant has laid out, as judgements of taste, like politics, belong fundamentally to a transitional sphere between nature and freedom.

To highlight the promise of Jordan Pascoe’s Kant’s Theory of Labour, my comments concern the diagnostic and prescriptive dimensions of the book’s excellent intersectional critique of dependent labour relations. The diagnostic dimension of Pascoe’s critique establishes that the organisation of dependent labour relations is a neglected problem of Kantian justice. The prescriptive dimension offers solutions to this problem but is underdeveloped. To enhance the book’s prescriptive dimension, I draw on the noted Africana philosopher W. E. B. Du Bois for guidance. For Du Bois, a constitutional republic ought to strive for the abolition of a ‘second’ slavery following the abolition of de jure black chattel slavery with the end of the American Civil War. Given Du Bois’ call for meaningful Emancipation, I argue that philosophers should reinterpret the Kantian normative ideal of freedom as universal independence to uproot the postbellum conditions of second slavery.

I respond to a challenge raised by Jordan Pascoe: Kant’s conception of obtaining full citizenship through working oneself up necessarily condemns some people to passive citizenship. I argue that we should not focus on work to establish universal full citizenship. Rather, a Universal Basic Income, an income paid regularly to everyone and without conditions, can secure everyone’s full citizenship. Moreover, I argue that such a scheme is more Kantian in nature than hitherto assumed.

Different from the autonomy of understanding in cognition and the autonomy of practical reason in praxis, the heautonomy in the judgement of taste is reflexive. The reflexivity consists not only in the fact that the power of judgement legislates to its own usage but also, and more importantly, it legislates to itself through its own operative process. This normativity, based on the self-referential structure of pure aesthetic judgement and the a priori principle of subjective, internal purposiveness, can be regarded as a self-discovering and self-flourishing principle that organically grows out of the aesthetic experience and, at the same time, regulates its growth in return. In this scenario, aesthetic freedom can be identified as a third kind of freedom different from Kant’s transcendental freedom and practical freedom – a flexible and living freedom with spontaneous legislation, but not bound by any determinate laws.

My response to Gabriele Gava’s Kant’s Critique of Pure Reason and the Method of Metaphysics (2023) focuses on Kant’s conception of the role of critique in the Critique of Pure Reason. On my account, Gava’s emphasis on the constructive elements of the Critique downplays the critique of former metaphysics elaborated in all three parts of the Transcendental Doctrine of Elements. After some comments on Kant’s conception of the Critique as a doctrine of method, I support this view by discussing the relation between transcendental philosophy and transcendental critique, Kant’s analysis of the faculties, and his transcendental deduction of space.

This article critiques Jordan Pascoe’s Kant’s Theory of Labour (CUP 2022). After outlining some of its many distinctive contributions, I consider Pascoe’s ideas on women, marriage, method, and the challenges involved in engaging with (classical) texts that express various ‘isms’. In addition to giving readers an introduction to many of the exciting ideas presented in the book, my aim is to stimulate further discussion of the kind all excellent books strive to create.

Elvira Basevich, Martin Sticker, and Helga Varden offered generative criticism of my monograph, Kant’s Theory of Labour. In this response, I explore how the resources they offer for thinking about gender, labour, and the state’s responsibility to ensure the material conditions of freedom can deepen both our attentiveness to patterns of systemic injustice in Kant’s political philosophy, and the resources Kant offers for addressing contemporary patterns of intersectional and material injustice.

The article addresses some aspects of Gava’s book, highlighting two main points: (1) the notion of philosophy in a cosmic sense; (2) its connection with the meaning of the concept of method. Regarding (1) I show how Gava’s interpretation of the systematic concept of philosophy does not account adequately for the scholastic concept. This has consequences for the notion of philosophy in a cosmic sense itself; its nature as an objective archetype and its personification in the ideal of a master of wisdom are not properly emphasized. These features are closely related to Kant’s claim that philosophy cannot be learned, which is connected with Kant’s peculiar idea of method. Regarding (2), I argue that ‘method’ for Kant does not concern only the construction of scientific systems, but also the establishment of a way of thinking, a stance embracing thought and action. The meaning of the postulates and the notion of ‘faith’ thus acquire a ‘weaker’ connotation, as an attitude, habitus, aimed at the establishment and promotion of a ‘life-structuring’ rationality, and not as an alternative route to a theoretical ‘commitment’.

I raise three objections for Gava’s thesis that the primary task of the Critique of Pure Reason is to develop a doctrine of method for metaphysics, understood as an account of the special kind of unity that a body of cognitions must exhibit to count as a science. First, I argue that this thesis has difficulty accommodating Kant’s concern with explaining the possibility of synthetic a priori judgements. This concern is motivated by a question that is prior to the issue of scientific unity. Second, I argue that the context of the passage in which Kant calls the Critique a treatise on method makes clear that the remark concerns the Copernican Turn. This suggests that the method treated in the book is the procedure required by the Copernican Turn. Third, I dispute Gava’s claim that the idea that confers unity on metaphysics is the cosmopolitan concept of philosophy.

The Fiery Test of Critique describes Kant’s indirect proof of idealism from the Antinomy of Pure Reason as the ‘nugget of gold’ in the Critique of Pure Reason’s Transcendental Dialectic. Here, I offer critical reflections on Proops’s reading of Kant’s indirect proof.

I respond to Karin de Boer, Thomas Land, and Claudio La Rocca’s comments on Kant’s Critique of Pure Reason and the Method of Metaphysics (CUP 2023). I first provide a quick outline of some of the main claims I make in the book.  I then directly address their criticisms, which I group into three categories. The first group of comments raises doubts concerning my characterization of the central tasks of the critique of pure reason. The second targets the fact that I downplay faculty analysis as an essential characteristic of the critique. The third has to do with my claim that the Critique of Pure Reason aims to show that metaphysics is capable of architectonic unity, where this unity is only achievable when we construe metaphysics according to the worldly concept of philosophy.

The main interpretative claims in the chapter on Kant’s critique of the ontological argument in Ian Proops’s The Fiery Test of Critique are critically discussed.

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.