Personal Agency: The Metaphysics of Mind and ActionPersonal Agency consists of two parts. In Part II, a radically libertarian theory of action is defended which combines aspects of agent causalism and volitionism. This theory accords to volitions the status of basic mental actions, maintaining that these are spontaneous exercises of the will a 'two way' power which rational agents can freely exercise in the light of reason. Lowe contends that substances, not events, are the causal source of all change