I found this work very hard to follow. Kant is differentiating what can be determined by reason. He focuses on discovering what can be determined by will (i.e., there is freedom to select something) vs. what already exists a priori. This search for both flexible and inflexible "truth" leads to a discussion of spirituality, and good and bad. The difference between Kant and others is that Kant seeks to "harmonize" rather than reconcile" philosophical points. The Fundamental Law of Pure, Practical Reason: "Act so that the maxim of your will can be valid at the same time as a principle of universal legislation." Kant attempts to climb higher than the mere desires of the Epicureans, heading toward something spiritual but elected via pure reason. I find it a hard climb to make. The bulk of this work heads toward a moralistic proof of good and evil and the proof of causality based merely on the possibility of it. Based on practical reason, there are only good and bad objects. ( )