 A related objection to foreknowledge without middle knowledge is that prophecy requires middle knowledge. See Pruss (2007) for a defense of a foreknowledge-only account of prophecy. Another issue related to divine providence is the efficacy of past-directed prayers. Kevin Timpe (2005) argues that adherents of simple foreknowledge or timeless knowledge and Molinists have the resources to explain the efficacy of prayers about the past, but open theism does not.