The gospel is the kingdom of God (Mt 4:23, 24:14; Lk 16:16; Acts 8:12). The parables are about the kingdom (Mt 13:24, 31, 33, 44, 45, 47; 18:23; 20:1; 25:1, 14). Jesus begins his ministry preaching the kingdom (Mt 4:17; Mk 1:14). He commissions his followers to preach the kingdom (Mt 10:7). Even after death, he preaches the kingdom (Acts 1:3). The kingdom is the Lord's mission. It’s what he dedicates his life’s work to. It’s his very purpose for coming, in fact (Lk 4:43). Though we don’t talk about it in church, the kingdom is the heart of the New Testament. So wouldn’t it behoove us to know what it is? It should. So what is it?