Finally, it remains open to deny (6), to hold that even if it is already accidentally necessary that Jones mow his lawn tomorrow, he nevertheless has it within his power to do something, for example, spend the day indoors, which is such that if he were to do it, it would be false that he mows his lawn (Plantinga 1986: 257). Jones can remain indoors tomorrow, and if he were to do that, the past would have been different; in particular, God would never have believed then that Jones would mow his lawn tomorrow. See also Mavrodes (1983) for a defense of the claim that events of the past are now preventable. Some philosophers object, however, to this sort of counterfactual power over the past.