 For Green, a person is free only if she is self-directed or autonomous. Running throughout liberal political theory is an ideal of a free person as one whose actions are in some sense her own. In this sense, positive liberty is an exercise-concept. One is free merely to the degree that one has effectively determined oneself and the shape of one’s life (Taylor, 1979). Such a person is not subject to compulsions, critically reflects on her ideals and so does not unreflectively follow custom, and does not ignore her long-term interests for short-term pleasures. This ideal of freedom as autonomy has its roots not only in Rousseau’s and Kant’s political theory, but also in John Stuart Mill’s On Liberty. And today it is a dominant strain in liberalism, as witnessed by the work of S.I. Benn (1988), Gerald Dworkin (1988), and Joseph Raz (1986); see also the essays in Christman and Anderson (2005).