The central claim here is that a human being (person, agent) is free with respect to a particular action A (or forbearance to perform A) inasmuch as (i) if she wills to do A then she has the power to do A and (ii) if she wills to forbear doing A then she has the power to forbear doing A (see, e.g., Chappell 1994:   103).[5]  So, for example, a woman in a locked room is not free with respect to the act of leaving (or with respect to the forbearance to leave) because she does not have the power to leave if and when she wills to leave, and a woman who is falling (the bridge under her having crumbled) is not free with respect to the forbearance to fall (or with respect to the act of falling) because she does not have the power to forbear falling if she wills not to fall (E1–5 II.xxi.9–10: 238). (Locke describes agents who are unfree with respect to some action as acting under, or by, necessity—E1–5 II.xxi.8: 238; E1–5 II.xxi.9: 238.) But if the door of the room is unlocked, then the woman in the room is able to stay if she wills to stay, and is able to leave if she wills to leave: she is therefore both free with respect to staying and free with respect to leaving. 