Romans1 and The Gospel

Why is the gospel the good news of Jesus Christ? This word was historically used to announce a new emperor or any significant past event. But now we find it announcing a new king in town with a kingdom that shall reign forever and ever coming to bring salvation through a message that is both power and powerful. What does this mean for all of us? ultimately this is good news for the world, for God has revealed his plan for the world and the king (Jesus) is at the centre of it all.