But Christians also believe that the incarnation ushered into the world not just a person but what in the New Testament is called “the kingdom of God.” This can be understood as the sphere of God’s rule, according to the New Testament theologian Richard Bauckham. Luke, the “beloved physician” who wrote one of the four Gospels and the book of Acts, told about Jesus traveling through cities and villages “proclaiming and bringing the good news of the kingdom of God.” Jesus wasn’t talking about ruling a country or a continent; instead, he would live and rule in the hearts of his believers, who would work to realize his will on earth as it is in heaven.