Kant moved the idea of freedom to the center of his philosophy, arguing that from a reflection on the nature of human freedom a self-critical assessment of its morally appropriate use could be gleaned.
Therein, that is, in construing his ethics from (subjective) self-reflection rather than resting it on presumed (objective) values, and in construing norms of interpersonal validity from the individual perspective ('bottom-up') rather than through ('top-down') references to prearranged ethical or metaphysical orders, lies Kant's innovation in ethics theory.
Please follow the link to download the full paper: Download-Link