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The Good News is that the promised Messiah - God's annointed - has returned. The Kingdom of God was to be established.
When Jesus begins to preach in Luke 4, he overtly references himself as the promised Messiah of Isaiah.
16 He went to Nazareth, where he had been brought up, and on the Sabbath day he went into the synagogue, as was his custom. He stood up to read, 17 and the scroll of the prophet Isaiah was handed to him. Unrolling it, he found the place where it is written:
18 βThe Spirit of the Lord is on me, because he has anointed me to proclaim good news to the poor. He has sent me to proclaim freedom for the prisoners and recovery of sight for the blind, to set the oppressed free, 19 to proclaim the year of the Lordβs favor.β
The Kingdom would have had connotations of return to power and re-establishment of the "ancient order." The Kingdom announced in Isaiah 40 - 66 would have indicated a new social order, one in which there is equality and goodness of all, and that the throne of David would be re-established.
Luke in particular understood this reversal - the oppressed would no longer be on the bottom, the poor would be rich, etc... Look to Mary's Magnificat (Luke 1:48 - 52) to see this.
To many, the idea was conflated with political liberation from Rome, but the Good News preached was actually just the new social order of Isaiah 40 - 66.
What made Jesus' teaching unique was precisely the fact that Jesus redefined the notion of Messiah as applying personally and not just politically.