In Mark's Gospel, he quotes Jesus as saying, "The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel" (Mark 1:15). Jesus's gospel begins with "repent and believe." Jesus claimed, "God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life" (John 3:16). That is, God's love is demonstrated in eternal life for those who believe in His Son. Jesus said, "I am the way, and the truth, and the life; no one comes to the Father but through Me" (Joh 14:6). His claim was that He was the sole access to the Father. In Luke's Gospel, Jesus left the desert experience and went to Nazareth. There, He read from Isaiah.
And the scroll of the prophet Isaiah was given to Him. He unrolled the scroll and found the place where it was written, "The Spirit of the Lord is upon me, because He has anointed Me to proclaim good news to the poor. He has sent Me to proclaim liberty to the captives and recovering of sight to the blind, to set at liberty those who are oppressed, to proclaim the year of the Lord's favor." And He rolled up the scroll and gave it back to the attendant and sat down. And the eyes of all in the synagogue were fixed on Him. And He began to say to them, "Today this Scripture has been fulfilled in your hearing." (Luke 4:17-21)Well, there it is. Jesus's gospel. At least, that's what He read from Isaiah. And He said, "Today this Scripture has been fulfilled in your hearing." So, that's it. The gospel of Christ is that captives are liberated, the blind can see, the oppressed are freed, and God's really feeling good toward everyone. "Today," He said. Is that it? If it is, we have a problem. There are still poor people, still prisoners, still blind people, still oppressed people ... and Jesus declared, "Today this Scripture has been fulfilled in your hearing." Not "sometime soon." If we take it at face value, Jesus failed. Oh, He helped a few in His day, but ... He didn't, by any means, make a dent in the problem then or now. Is Jesus talking about the poor people of the world (who still exist unabated), or something else? Here's a clue. In Luke, Jesus says, "Blessed are you who are poor, for yours is the kingdom of God" (Luke 6:20). Compare that to Matthew's version (Matt 5:3). Matthew quotes Jesus speaking of "the poor in spirit." Huh. How about that? Could it be that neither Isaiah nor Jesus had people without funds ("the poor") in view, but the spiritually poor? Is it possible that "the gospel" that Jesus proclaimed was more concerned with the spiritually poor, the spiritual captives, the spiritually blind, the spiritually oppressed? Is it remotely possible that Jesus actually accomplished on the Cross the spiritual freedom for all these spiritually oppressed people?
Of course, that won't do for some. They're sure Jesus's was a social gospel. He meant well; He just didn't quite pull it off. He intended good things for the socially oppressed, but humans have blocked His efforts and we still have all these "lost sheep" in the physical world. If we could all just get on board, maybe we could make this world a better place, because that's Jesus's gospel. Or ... not. Jesus said, "I am the good shepherd, and I know My own and My own know Me, even as the Father knows Me and I know the Father; and I lay down My life for the sheep. I have other sheep, which are not of this fold; I must bring them also, and they will hear My voice; and they will become one flock with one shepherd" (John 10:14-16). Jesus's spiritual sheep were not in question; they were assured. "My sheep hear My voice, and I know them, and they follow Me; and I give eternal life to them, and they will never perish; and no one will snatch them out of My hand" (John 10:27-28). The spiritual sheep -- with spiritual poverty, blindness, captivity, oppression -- had the certainty in Christ of eternal life ... because He would lay down His life for them. Jesus's gospel wasn't a social gospel. It was a gospel of redemption. And it was accomplished in Him. Like Paul and the rest of Scripture preached.