The book provides a new way of understanding one of Kant's most difficult ideas. It is the idea that we can be the cause of our actions only if the act of our will is free of everything that makes up who we are as individuals. This entails that our free will does not exist in the same time that includes everything that determines our individuality.Greenberg attempts to explain this idea through an analysis of Kant's concept of an action. The key is that the concept includes the will as the cause of the action; so included, the causal connection is atemporal.