For my students…
There are three points of view one can adopt when considering the return of Jesus.
The first is to believe that the world is going to get worse and worse until Jesus comes back, when, He will judge the world and pour out His wrath on sinners. Currently, many people who lean to this viewpoint believe the return of Christ is near. Mostly in the west, where Christianity is being abandoned, will you find people holding this view.
Second, you can say that God already poured out His wrath on sinners two thousand years ago, onto Jesus, and after Jesus rose from the dead we began to live in a new creation, and the world has been getting better and will continue to do so until Christ’s return. People who hold to this view tend to believe that the return of Christ is many years away, possibly thousands of years away.
And third, one can believe that, just like riding a roller coaster, sometimes the world will be good, and sometimes not. Jesus is coming back, but the roller coaster ride won’t end till He does and it won’t indicate when He will.
Technically speaking, the first is called Premillennialism, the second is Postmillennialism, and the third is Amillennialism.
Obviously these are very brief descriptions, and there are variations to each viewpoint.
The term “millennium” is found in Revelation 20, and refers to a thousand year reign of Christ. In the first viewpoint the millennium (taken to be a literal thousand years) comes after Christ’s return and takes place on the earth. With the second viewpoint, the millennium (usually not taken as a literal thousand years) will happen before Christ’s return and will take place on the earth. And in the third, the millennium (not a literal thousand years) is happening now, but in heaven.
Pursuit of Percipience 