In a careful study of Biblical eschatology (a study of last things), the study of Christ's work during the last three and one-half years of His earthly ministry is of paramount importance to any student or reader of the Bible. Jesus' continued work through His apostles during the following forty years after He ascended into Heaven is what made all the prophecies and promises of God come to completion. It is this forty year period between 30 AD and 70 AD that this book deals. Study it carefully. Without that development period in which God was making all things new, man could not have the great blessings that God has provided for him.