Jesus' prophecies about the kingdom of God appearing imminently, within the lifetimes of his disciples was failed prophecy! As time went on past his death, those who wrote the late gospels start pushing his return farther and farther out, until we get to the point where they have Jesus saying that his kingdom is not of this earth. This is how Christian writers adapted to Jesus' failed prophecies: pushing his return farther and farther out, pas the death of the disciples, past the Jewish revolt against Rome, past the destruction of the Temple and Jerusalem, until Jesus' kingdom was no longer a physical kingdom.