“good news of the kingdom will be proclaimed.” In this context, the “good news of the kingdom” refers to the coming of the reign of Jesus Christ as king on the earth (the Millennial Kingdom), and the fact that Jesus, John the Baptist, and Jesus’ disciples all taught that it was near (Matt. 3:2; 4:17; 10:7; Mark 1:15) The coming kingdom, called the “Kingdom of God” and “the Kingdom of Heaven” was the primary subject of Christ’s teaching. Although some people say that the Kingdom of God was the time that Jesus was on earth, Matthew 24:14 (and Luke 21:31) shows that cannot be the case. In the time when Matthew 24:14 applies, Jesus will have already ascended into heaven and will not be on earth any longer, but Christ’s kingdom on earth, the Millennial Kingdom, will still need to be a major subject of preaching and teaching.
Jesus foretold that the Good News of the kingdom would be preached to the whole world, and then the end would come. But a study of the Tribulation period shows how difficult preaching the Good News will be because the Antichrist and evil people will pretty much control the world. But the prophecy of Jesus will be fulfilled by an angel flying high in the sky and proclaiming the Good News to the people of earth (Rev. 14:6). Everyone on earth will have a chance to hear the Good News and believe. Furthermore, soon after the angel proclaims the Good News, the end will come. The seven last plagues, the bowl judgments, come upon the earth (Rev. 16:1-21), then Jesus comes from heaven and conquers it and defeats the army of the enemy (Rev. 19:11-21), and then Jesus sets up his Millennial Kingdom on earth.
[For more on Jesus’ Millennial Kingdom, see Appendix 3, “Christ’s Future Kingdom on Earth.”]