 Notice that counterfactual power over the past is not the same thing as changing the past. Under the assumption that there is only one time line, changing the past is incoherent since it amounts to there being one past prior to t2 in which God has a certain belief at t1, and then Jones does something to make a different past. That requires two pasts prior to t2, and that presumably makes no sense. What (CPP) affirms instead is that there is only one actual past, but there would have been a different past if Jones acted differently at t2. (CPP) also does not require the assumption that what Jones does at t2 causes God to have the belief he has at t1. There is much debate about the way to analyze the causal relation, but it is generally thought that causation does not reduce to a counterfactual dependency of an effect on its cause. The dependency of God’s belief on Jones’ act need not be a causal dependency. (CPP) is therefore weaker than the claim that Jones’ act at t2 causes God’s belief at t1. A discussion of the counterfactual dependence of God’s past belief on human future acts is given in Zagzebski (1991, chap 4).