Kant's mature writings about morality and right fall into four different categories. (1) There are the foundational writings, which include Groundwork of the Metaphysics of Morals (1785) and the Analytic of the Critique of Practical Reason (1788). (2) There are the writings that attempt to ground a morally motivated answer to metaphysical or religious questions. Kant deals with this concern toward the end of all three Critiques: in The Canon of Pure Reason, The Dialectic of Practical Reason and the Methodology of Teleological Judgment. (3) There are the writings in which Kant applies ethical principles. The central work here is the final product of Kant's ethical thought, the Metaphysics of Morals (1797-8), but this category also includes other works on politics and religion of varying lengths, including On the Common Saying: That May Be Correct in Theory but Will Not Work in Practice (1793), Religion Within the Boundaries of Mere Reason (1794), and Perpetual Peace (1795), as well as a number of short occasional pieces, such as Answer to the Question: What Is Enlightenment? (1784), What Does It Mean To Orient Oneself in Thinking? (1786), The End of All Things (1794), On A Presumed Right to Lie from Philanthropy (1797), and Conflict of the Faculties (1798), as well as part of the Methodology of the Critique of Practical Reason and part of the Methodology of the Critique of Pure Reason (1781) (“The Discipline of Pure Reason in its Polemical Use”).