One key theme of mission theology is the Kingdom of God. Moreau says the “kingdom of God as a motif runs through every layer of the foundational mission focus. It grows or is increased by evangelistic and church-planting activities.” When Jesus was on earth he spoke often of the Kingdom of God. When he was brought before Pilate in the final hours before his death, he admitted to being the King of kingdom “not from here.” (John 18:36) The Holman Bible Commentary says, “many individuals throughout Christian history have misinterpreted the kingdom of God in earthly terms.” Since it is not an earthly Kingdom, one cannot enter in his earthly body. To get to the Kingdom, one must exit this life through either death or the rapture. Then the person’s name must be entered in the Lamb’s Book of Life, which can only happen through salvation. The goal of mission is to bring people to this knowledge and decision.
The Kingdom of God will not come until the whole world has been evangelized. Matthew 24:14 says, “And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.” George E. Ladd notes that the “book of Acts shows that the apostles set out to fulfill this mission.”
Matthew 6:33 says, “But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.” The Apologetic Study Bible says that Jesus “used dramatic rhetoric to highlight the inconsistency of claiming faith in God while remaining anxious about daily needs.” To participate in mission is to set aside earthly worries and focus on reaching people for the Kingdom. Mission becomes more about souls and less about temporal things.
Another key theme is the return of Jesus. Jesus is coming back someday. It could be today or next week or hundreds of years from now, but He is coming back. This not only “provides Christians with hope, enabling them to persevere in their own growth as followers of Chirst,” but also motivates people to get the news out. What if today was the last day before Jesus came back and the fates of millions were decided?
Robert E. Coleman says, “The fact that our Lord has not already returned to establish his kingdom is evidence of his desire to see…the gospel presented to every person for whom he died.” The second coming is not late, but God is delaying “because He wants sinners to come to Christ and be saved from the coming wrath.” Getting this message out is a key theme of mission.
 Moreau, A. Scott, et al. Introducing World Missions: A Biblical, Historical, and Practical Survey (Grand Rapids, Michigan: Baker Academic, 2004), 81
 Winter, Ralph D., and Steven C. Hawthorne, Perspectives on the World Christian Movement: A Reader. 4th ed. (Pasadena, California: William Carey Library, 2009), 89
 Cabal, T., Brand, C. O., Clendenen, E. R., Copan, P., Moreland, J., & Powell, D., The Apologetics Study Bible: Real Questions, Straight Answers, Stronger Faith (Nashville, TN: Holman Bible Publishers, 2007), 1539.
 Moreau, 85
 Winter, 202
 Wiersbe, Warren, Wiersbe’s Expository Outlines on the New Testament (Wheaton, IL: Victor Books, 1992), 763