Kant's practical philosophy in its entirety comprises ethics and philosophy of right, moral theology, moral anthropology, and the philosophy of history, and combines them into one impressive theoretical structure. The theory of the self-legislation of pure practical reason developed in the Groundwork of the Metaphysics of Morals (1785) and Critique of Practical Reason (1788) stands at the center of this system. Through this theory Kant provides an entirely new theoretical foundation for justification in practical philosophy. In the previous history of practical philosophy foundations and first principles were sought in objective ideas, in a normative constitution of the cosmos, in the will of God, in the nature of man, or in prudence in the service of self-interest; but Kant was convinced that these starting-points were without exception inadequate for the foundation of unconditional practical laws, and that human reason could only concede absolute practical necessity and obligatoriness to norms that arose from its own legislation.