The gospel is the the good news that Jesus preached "... Jesus came into Galilee, preaching the gospel of the kingdom of God" (Mark 1:14). This is the gospel of Jesus. All over the bible, from the promise to Abraham in Genesis to the second coming of Jesus in Revelation, the Lord reveals that his kingdom will be on earth. This message is supposed to be good news to us, especially considering the condition of the world. We should be glad to know that God is going to straighten out the trouble and confusion that's presently in the world. Jesus even told us to pray for the fulfillment of his gospel, "Thy kingdom come. Thy will be done in earth, as it is in heaven" (Matthew 6:10). Jesus also warned us to repent (turn from our sins) and be prepared for the coming of his kingdom. If we truly believe the gospel, then we will obey God's commandments. "...The unrighteous shall not inherit the kingdom of God" (I Corinthians 6:9).
However, Jesus said the… Blessed are the meek: for they shall inherit the earth. (Matthew 5:5). Jesus promised us we would dwell with him on the earth. That's right, Jesus is returning to establish the kingdom of God. If we have faith and obey him, we will rule with him on the earth, "And hast made us unto our God kings and priests; and we shall reign on the earth" (Revelation 5:10).