The gospel of the in-breaking Kingdom of heaven is good news to the poor because it changes the prevailing culture. It breaks down walls of disparity between the haves and the have nots. When we preach an abbreviated gospel that is primarily about salvation from hellfire after we die, nothing comes from it to change the culture here and now.
It falls short of “your kingdom come, your will be done, on earth as it is in heaven” (Matthew 6:10). Jesus intended for his gospel to noticeably affect society and the way people treat one another. When the gospel takes hold of people’s hearts and minds, they begin to embody the essence of “on earth as in heaven.”