Tradition tells us that the Gospel is a message of personal redemption, or better that the Gospel is Christ’s death, burial, and resurrection (1 Cor 15:3-4). But what does that mean, exactly? I think before we quote St. Paul in defining the Gospel, we might first determine what the Gospel really is.
The Gospel is the kingdom (Mt 4:23, 24:14; Lk 16:16; Acts 8:12). That is explicitly what the Bible calls it. The Gospel is also peace (Acts 10:36; Eph 6:15) and our salvation (Eph 1:13). The Gospel of Jesus Christ (Mk 1:1) is the Gospel of his glory (2 Cor 4:4). The glory of Christ is the kingdom of heaven, and the kingdom of heaven is the message of Christ's ministry. Not that when we die we escape the earth but rather that the kingdom is on the earth.
The Gospel is all these things, but first, it’s the kingdom.
Why the kingdom? Because through the kingdom, all these other things are manifest. The kingdom is the very reason for the New Testament. It was Christ’s very ministry.
Christ's parables are about the Kingdom. Let’s look at the Gospel according to Matthew and see that the subject of every parable is the kingdom of heaven. The kingdom may be compared to a man who sowed good seed (13:24) or to a mustard seed (13:31) or to leaven (13:33) or to a hidden treasure (13:44) or to a merchant in the market for pearls (13:45) or to a fishing net (13:47). The kingdom is like a king who wishes to settle his accounts (18:23) or a landowner in search of labor (20:1). It is like ten virgins (25:1) or a man on a journey (25:14). You get the idea. The kingdom is the single, common thread in the parables. When Jesus tells parables, in fact, he shares secrets of the kingdom (Mt 13:11; Lk 8:10).
So the parables are about the kingdom. That doesn’t mean his entire ministry was about the kingdom, does it?
On the contrary, the kingdom was, indeed, his ministry.
Note what Jesus commissions his apostles to do when he sends them into Israel to preach the Gospel (Mt 10). He instructs them to preach the kingdom (Mt 10:7).
And note what Jesus does after he is baptized and tempted, when he begins his ministry (Mt 4:17; Mk 1:14). He begins his ministry preaching the kingdom.
Jesus begins his ministry preaching the kingdom. He instructs his own to preach the kingdom. His parables are about the kingdom.
Even after his resurrection, he preaches the kingdom. “He presented himself alive to them after his suffering by many proofs, appearing to them during forty days and speaking about the kingdom of God.” (Acts 1:3)
The Gospel is the kingdom, and the kingdom is integral to New Testament theology, and even hinted at in the Old Testament. And what effected the kingdom? Sure, we can say that Christ’s death, burial, and resurrection did that. Sadly, though, that’s all we ever call the Gospel. Ask a random believer what the Gospel is. Will he call it the kingdom? Highly unlikely.
But that’s exactly what it is. So, shouldn’t we know what the kingdom is? I say we don’t really know what it is, mostly because we don’t really think about it. But we should. We preach to each other all the time, yet seldom ever the kingdom.
That is a shame.
So, what is the Gospel? That is, what is the kingdom?