Libertarianism is the view that determinism is false and that our choices are radically free. Just as theists believe that God is the first cause—the uncaused cause of everything that exists—libertarians believe that human agents are the first cause of their own choices. We’re all, so to speak, miniature dieties.
http://www.psychologytoday.com/blog/philosophy-dispatches/201209/is-free-will-myth