My mistake, a Critique of Practical Reason. Pure Reason handles metaphysics and not ethics. There is also Groundwork of the Metaphysics of Morals, which is simi

My mistake, a Critique of Practical Reason. Pure Reason handles metaphysics and not ethics. There is also Groundwork of the Metaphysics of Morals, which is similar to Practical Reason but written earlier in Kant's career