By personal freedom I mean the “Kantian” capacity of bringing about spontaneously a new series of events. It is characterized by three conditions: there is an alternative, the explanation of the process needs to use action-words, deterministic laws cannot contain such expressions. The will is not a particular cause, but only a dependent moment in the process. Causality of freedom should be defined by the logical structure of the involved laws. Actions can be explained, but only ex post.