Eschatology is from two Greek words, eschatos, meaning “last,” and logos, meaning “the word.” Therefore, eschatology is “the study of the last word.” It’s as if Jesus says, “I’ve got one more thing to pass on to you.”
THE ALREADY AND NOT YET-this is the concept that the kingdom of God has truly come, but not in its fulness. The personal promises of a new heart are fulfilled among those who believe in Jesus’ first coming; the world promises of a new world wait for their fulfillment in Jesus’ second coming.
“If you read history you will find that the Christians who did most for the present world were precisely those who thought most of the next. It is since Christians have largely ceased to think of the other world that they have become so ineffective in this.” C.S. Lewis
1. Christ is coming back in power and glory.