The Critique of Practical Reason (Kritik der praktischen Vernunft) is the second of Immanuel Kant’s three critiques, first published in 1788. It follows on from his Critique of Pure Reason and deals with his moral philosophy. The second Critique exercised a decisive influence over the subsequent development of the field of ethics and moral philosophy, becoming the principle reference point for ethical systems that focus on the rightness or wrongness of actions themselves, as opposed to the r ...