One great final event must happen before the new heaven and the new earth appear. God will sit as the judge of all people. This event is called ‘the last judgement’.
Immediately at a person’s death, God decides whether that person is one of his people. So we may ask whether this final judgement is also necessary. Clearly, at that judgement, everyone already knows what God’s judgement will be.
However, it is important for everyone to see that God’s judgement is right. People can only respect God properly when they see his perfect character.
This event happens at the end of the present world. It is necessary, therefore, for God to deal with every matter that happened in the present world. God has declared that the new heaven and earth will be perfect (Revelation 21:3-5). Therefore, no matter must remain from the former world to cause trouble in the new world. The new heaven and earth will only appear after God has dealt with everything and everyone from the former world.
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