The Critique of Practical Reason by Immanuel Kant is a philosophical work that examines the nature of morality and the limits of human reason. Kant argues that morality is based on a universal moral law, and that human reason can be used to discover this law. He also argues that morality is
The Critique of Practical Reason is the second of Immanuel Kant's three critiques, published in 1788. Hence, it is sometimes referred to as the "second critique". It follows on from Kant's first critique, the Critique of Pure Reason, and is one of his major works on moral philosophy. While Kant had already published one significant work in moral philosophy, the Groundwork of the Metaphysics of Morals (1785), the Critique of Practical Reason was intended to develop his account of the will as determinable by the moral law alone, place his ethical views within the larger framework of his system of critical philosophy, and expand on certain themes in his moral philosophy such as the feeling of respect for the moral law and the concept of the highest good.