Eschatology (from Greek, eschata "last things" ) is the doctrine of last things. Every system of theology has its eschatology. If there is a beginning of the world, then there also is a end of the world. God does not have a beginning, nor an end; He is eternal. But the world that He has created had a beginning, and it also has an end. The biblical view of time distinguishes between God's time and the time of the world (II Pet. 3:8). And the biblical concept of time of the world is not cyclical, that is, it is not the repeating the same series of events after the end of each cycle. The biblical concept of the time of the world is linear in the sense that it is series of events that have a beginning and an end. The Eschatology of a Christian theology is the doctrine of the events leading up to that end as revealed by God and recorded in the Scriptures. It is not based on human speculation nor on the inferences from scientific theories (the General Theory of Relativity and the TOE -- Theory Of Everthing). It is based on what God has revealed about the end of the world and that has been recorded in the Scriptures.