God and eternity are important concepts in theology. Theists say that God is eternally existent. How this is understood depends on which definition of eternity is used. God may exist in eternity or outside the human concept of time, but also inside of time. Definition In William Rowe's review of Nelson Pike's God and Timelessness the two common definitions of eternity are given. The first is timelessness, which could be described as a timeless existence where categories of past, present, and future just do not apply. The second definition is of God existing in all time dimensions such as past, present, and future. In this case, God would have already existed for an infinite amount of time and will continue to do so. Pike mainly wonders if God could be timeless and all knowing. He argues that if God knows all, then he will know what a person will do in the future and that will be the only thing they can do because that's what God knows will happen, so there's only one option. But, Rowe argues, if God is timeless then he would not know what that person is planning to do before they do it, so therefore he could not be all knowing if he is timeless but if he is all knowing he could not be timeless. Rowe mentions how Pike uses multiple arguments to disprove Anselm of Canterbury and another theologian of their own arguments about why God is eternal (Anselm was a theist who believed God was all knowing and eternal). Stewart Sutherland also talks about similar perspectives regarding the definition of God's eternity. Sutherland agrees with Nelson's Pikes conclusion that the two common definitions of eternity are defined as timelessness which could be described as a timeless existence where categories of past, present, and future just do not apply. The second definition is of God existing in all time dimensions such as past, present, and future. However, it has been argued that if God is timeless then he cannot be omniscient, because there are many things which a timeless being cannot know. Therefore, God could not know what is happening now, what will happen tomorrow, or what happened yesterday. If this argument is true, it would seem to eliminate the idea of God's foreknowledge, and this will have the advantage that it avoids at least some of the difficulties of the compatibility of