The Critique of Practical Reason is the second of Immanuel Kant's three critiques and it deals with Kant's own moral philosophy and his views on free will. A masterpiece of philosophical writing. The theoretical use of reason was concerned with objects of the cognitive faculty only, and a critical examination of it with reference to this use applied properly only to the pure faculty of cognition; because this raised the suspicion, which was afterwards confirmed, that it might easily pass beyond.