Grace, salvation, and the last things · Question 9
When Jesus comes, will there be a kingdom on earth lasting exactly a thousand years?

The question: “Do I have to get the end-times timetable right to become a citizen of the millennial kingdom?”
The Church's answer: The ‘thousand years’ of Revelation sits inside a context full of visions and symbols. The annotated Bible of the bishops' conference explains that there have been readings which take it as a future earthly kingdom and symbolic, spiritual readings which take it as the span from Christ's first coming to the end, and it warns against elaborate speculation. The Church does not teach that every believer must hold to the calendar of a political kingdom lasting exactly 1,000 years.
There is a clearer boundary as well. The Church rejects the millenarianism and the secular messianism by which a human leader or movement claims it can build the complete messianic kingdom within history and demands absolute obedience to itself. The kingdom of God has already begun in Christ, but the complete defeat of evil and death comes about through the Lord's return and the action of God, not through the victory of a human empire.
If they press further: “So is Revelation 20 just a meaningless game with numbers?” — no. It carries the hope that the power of evil is not unlimited but is restrained by God, and that the martyrs and the faithful share in the victory of Christ. We accept both things at once: that several readings of the details are possible, and that the central hope of the text is clear.
In one sentence: “The Church doesn't tell us to wait for a perfect political kingdom of exactly a thousand years built by human beings. The thousand years of Revelation has to be read carefully, inside the hope that evil is restrained and the victory of Christ is brought to completion.”