Abstract
When Aristotle said that an action is voluntary if its source lies within the agent rather than outside, he added that an action done from desire or anger is a voluntary one. He dismissed as absurd the suggestion that desire or anger are external forces, and can be classed in consequence as compulsions. In doing this he was rejecting one use of a device whose implications I want to explore in this paper—the device of selecting among the phenomena of our mental lives some which are truly part of us, and distinguishing them from others which are not. This device is in turn a manifestation of a capacity that seems to be unique to persons—the capacity to make judgments about the forces within us that move us to action, and to identify with them or wish them to be otherwise. In exploring the implications of the device, therefore, I shall be trying to assess some of the implications of having the special capacities of a person.