The book closes with a brief Postscript on Kant’s ‘practical metaphysics.’ In the Critique of Practical Reason and elsewhere, Kant introduces three ‘postulates of pure practical reason’, which concern God’s existence, freedom of the will, and the immortality of the soul. We briefly discuss whether reason eventually finds in a practical mode what it had been looking for in a speculative mode, namely, the unconditioned. (The answer is: almost, but not quite.)