The gospel of the Lord is the good news of his kingdom — his kingship restored to the earth in his anointed. Here it is in summary:
Ephesians 4 10 He who descended is the very one who ascended higher than all the heavens, in order to fill the whole universe. (NIV)
The Bible’s whole story in that verse. Our heavenly sovereign entrusted his earthly realm to people who rebelled against his kingship and ended up as captives to evil instead. Instead of using force to defeat force, God’s anointed ruler joined us in our captivity, dying at the hands of the rulers who were puppets of evil. When God raised him out of death, the captives enslaved under death were set free — free to live in the reign of God’s anointed. When the king was restored to us, his kingdom was restored to the universe.
Since God designed humans to be agents of the divine sovereign’s reign in his earthly realm (Genesis 1), the Messiah restored this mandate to humanity. The resurrected king gave gifts to humanity. His gifts were people — people entrusted with the responsibility to share in his management of the planet, by leading humanity into communal life under his kingship:
Ephesians 4 11 So Christ himself gave the apostles, the prophets, the evangelists, the pastors and teachers, 12 to equip his people for works of service, so that the body of Christ may be built up 13 until we all reach unity in the faith and in the knowledge of the Son of God and become mature, attaining to the whole measure of the fullness of Christ. (NIV)
This is unique. Any other ruler would have been wary of trusting power to ex-rebels, but Jesus entrusts his regal dominion to people, servants who empower the whole of humanity to grow up into Christ, our king.