Christian theism has traditionally claimed that God knows the future. But why is divine foreknowledge important? In this essay, I argue that divine foreknowledge is valuable to Christian theism and that a hefty theological price must be paid if it is rejected. I also attempt to show that the range of knowledge available to God in theological models that deny divine foreknowledge is significantly less than claimed by proponents of these views. In particular, I argue that the God of such models could not know future physical necessities, physical probabilities, divinely intended future free acts, or future events required by the divine nature.