The entire theme of Jesus’ preaching was God’s Kingdom:
"I must declare the good news of the kingdom of God, because for this I was sent forth.” (Luke 4:43)
Most are familiar with the model prayer. In it, Jesus taught us to pray for God's Kingdom to come:
“Our Father in the heavens, let your name be sanctified. Let your kingdom come. Let your will take place, as in heaven, also upon earth.” (Matthew 6:9-13)
Daniel 2:44 says more about this kingdom:
“In the days of those kings the God of heaven will set up a kingdom that will never be brought to ruin. And the kingdom itself will not be passed on to any other people. It will crush and put an end to all these kingdoms, and it itself will stand to times indefinite.”
After that, mankind will be under just one government, God’s Kingdom. That Kingdom will do God’s will and bring great blessings such as removing Satan and his demons. (Revelation 20:1-3) The Bible also mentions that faithful humans will no longer get sick and die. Instead, under Kingdom rule they will be able to live forever. (Revelation 22:1-3) The earth will be made into a paradise.
For much more, see:
What Is God’s Kingdom? (WBTS)
When will God's Kingdom come?
When Will God’s Kingdom Come? (WBTS)
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