 Like Hume, Kant seeks to reconcile freedom with a commitment to causal determinism. Yet the two philosophers operate with different conceptions of causal necessity and very different conceptions of freedom. For present purposes, it is important to focus on the latter. Hume concentrates on the liberty of spontaneity, the only idea of freedom “which it concerns us to preserve”. His treatment looks downstream from the will to its execution in action. A person has liberty when her action is caused by her will, which Hume equates with an occurrent motive or desire (T 2.3.1.2). The question of what ultimately moves the will is irrelevant. Such causes are found in the person’s character and circumstances, and they determine her will with the same necessity that determines everything else in nature. Kant, by contrast, looks upstream to what determines the will: “It is here a question only of the determination of the will and of the determining ground of its maxims as a free will, not of its result” in bodily action (CPrR 5:45). One way of putting it is to say that Hume’s account concerns the freedom of action, while Kant’s concerns freedom of the will. Both are concerned with the freedom of the person or agent, but Kant thinks the person is not truly free unless her will is free. This is the first point about the main difference between Kant and Hume.