Immanuel Kant was a German philosopher who is widely considered to be a central figure of modern philosophy. "The Critique of Practical Reason" is the second of Immanuel Kant's three critiques, first published in 1788. It follows on from Kant's 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, beginning with Johann Gottlieb Fichte's Doctrine of Science and becoming, during the 20th century, the principal reference point for deontological moral philosophy. This seminal text in the history of moral philosophy elaborates the basic themes of Kant's moral theory, gives the most complete statement of his highly original theory of the freedom of will, and develops his practical metaphysics.