What is Eschatology?

Eschatology is the study of “last things” or prophecy. It has been observed that approximately 25 percent of the Bible deals with prophetic truth. That means that at the time of its writing, one-fourth of scripture was pre-written history. Many prophecies have come to pass, but much of God’s Word is yet to be fulfilled.
Biblical Eschatology is the capstone of systematic theology. More than any other major field of theology, it has suffered much at the hands of its interpreters. Even among those whose confidence in the inspired Word of God is unquestioned there exists widely divergent schools of interpretation (Dr. J. D. Pentecost).