This does not mean that Sanders believes God's knowledge of the future is “limited” as some critics have charged. Rather, Sanders holds that what is referred to as “the” future is not an ontological reality—it does not exist. If it is does not exist then there is literally “no thing” or actuality for God to know. Open theists are not saying that there is a reality about which God is ignorant (which would be limited omniscience). The denial that God has exhaustive definite foreknowledge of future contingent events has been the single most controversial aspect of open theism.