Some commentators think that Lockean freedom (or, as Locke also calls it, “liberty”) is a single power, the power to do what one wills (Yolton 1970: 144; D. Locke 1975: 96; O’Higgins 1976: 119—see Chappell 1994: 103). However, as Locke describes it, freedom is a “two-way” power, really a combination of two conditional powers belonging to an agent, that is, to someone endowed with a will (see Chappell 2007: 142). (A tennis ball, for example, “has not Liberty, is not a free Agent”, because it is incapable of volition (E1–5 II.xxi.9: 238).) In E1, Locke’s definition reflects his conception of the will as a power of preferring X to Y, or being more pleased with X than with Y. But in E2–5, Locke’s definition reflects his modified conception of the will as a power to issue commands to one’s body or mind (see Section 2 above):