In Mark 1:1, we read of the “beginning of the gospel of Jesus Christ.” Gospel means good news. What was the gospel—or good news—Jesus preached? Verse 14 gives the answer: “Now after that John was put in prison, Jesus came into Galilee, preaching the gospel of the kingdom of God.”
Christ’s gospel is the Kingdom of God. Why is it important for us to understand the Kingdom of God? Because, Christ said, “The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel” (verse 15). In order to be saved, we must believe the gospel! To believe, we must know what it is. What is the Kingdom of God?