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The Critique of Practical Reason is the second of Kant's three Critiques, following Critique of Pure Reason . In it he distinguishes between actual practical reason and desire-based practical reason, arguing for the first and against the application of the second. He sees practical reason as something to be cultivated and moreover believes Freedom can be proven by it

If there exists on any subject a philosophy (that is, a system of rational knowledge based on concepts), then there must also be for this philosophy a system of pure rational concepts, independent of any condition of intuition, in other words, a metaphysic. It may be asked whether metaphysical elements are required also for every practical philosophy, which is the doctrine of duties, and therefore also for Ethics, in order to be able to present it as a true science (systematically)