If you'll take the time, you'll find the core message of Jesus was about the kingdom of God. Over and over again we find summary verses like this one:
Matthew 4:23 - And Jesus went about all Galilee, (1) teaching in their synagogues, (2) preaching the gospel of (what) the kingdom, and (3) healing all kinds of sickness and all kinds of disease among the people.
In fact, Jesus said the object of the gospel He preached, and commanded us to preach, is the kingdom of God. Consider what Jesus said in His olivet discourse:
Matthew 24:14 - "And this gospel of (what) the kingdom will be preached in all the world as a witness to all the nations, and then the end will come."
There are also certain kingdom characteristics in the lives of believers that the Scriptures point out to us as signs of His kingdom. In essence, when believers manifest certain characteristics of the kingdom in their lives, we can know the kingdom of God is present. And, conversely, when a believer doesn't manifest these kingdom characteristics, we can also safely assume the kingdom of God is far from them.
This is a sobering thought. Character, holiness, and sanctification matter. Do you want to discover more about the signs of life in the kingdom? Then keep listening.
The following is a study of Acts 4:32-5:16.