Summary

Allison's central thesis is that Kant's concept of freedom is best understood not as a mysterious metaphysical capacity but as a specifically transcendental requirement for the possibility of morality. He argues that Kant's vindication of freedom rests on showing that it is a necessary presupposition for our status as rational agents capable of acting according to duty. This interpretation counters attempts to locate freedom in empirical psychological phenomena or speculative metaphysical claims, grounding it instead in the conditions of our practical rationality.

The book explicates how Kant's conception of freedom, termed "transcendental freedom," is distinct from "practical freedom" (the ability to act according to reason). Allison demonstrates that transcendental freedom is the condition for practical freedom, enabling agents to initiate causal chains from themselves, independent of deterministic natural causes. Readers gain a rigorous understanding of Kant's argument for autonomy, the compatibility of freedom with natural causality (transcendental idealism), and the implications for moral responsibility.

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Key concepts

Transcendental Freedom — The capacity of reason to be the cause of its own determinations, independent of empirical causality.
Practical Freedom — The ability of a rational agent to act according to their own maxims or laws, rather than being solely determined by inclinations.
Autonomy — The property of the will by which it is a law to itself; acting according to self-legislated moral principles.
Transcendental Idealism — The philosophical system that distinguishes between phenomena (appearances) and noumena (things-in-themselves), arguing that our experience is structured by the mind.
Noumenal Self — The self as it exists independently of experience and empirical determination, posited as the source of transcendental freedom.