What is the Kingdom of God?

Short answer

The Kingdom of God is God's rule over His people through Jesus Christ the King. It is not a political state: it begins now in the hearts of those who trust Him, and it will be revealed in full when Christ returns.

The Kingdom of God is one of Jesus’ main themes. He began His ministry by announcing it, told many parables about it and taught His followers to pray for it. Yet people have always misunderstood it, from the Pharisees of His day to many readers now. The Bible’s answer is both simpler and bigger than a country or a church: the Kingdom is where God rules as King.

Not a kingdom of this world

When Jesus stood before Pilate, accused of claiming to be a king, He gave a surprising answer.

Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.
John 18:36 · King James Version (1769)

John MacArthur explains that Jesus meant His kingdom is not tied to earthly political institutions and does not come from the sinful world system that opposes God. Earthly kingdoms keep themselves in power by force; if His were of that kind, His servants would have fought. The New Geneva Study Bible agrees that Jesus really is a King but did not try to set up His rule by violence, which was a complete puzzle to Pilate. Alexander Lopukhin adds that Pilate, as a Roman official, had no reason to fear it.

The Pharisees had made the same mistake from the other side. William MacDonald notes that, as Jews, they expected a kingdom that would come in great power with outward, political signs. Jesus told them something different.

Already here, and still to come

And when he was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation: Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you.
Luke 17:20–21 · King James Version (1769)

The key phrase can be read in two ways, and commentators say so openly. Albert Barnes lists both: God’s reign is in the heart, or the new age is already in the midst of the listeners, since the Messiah has come. John Wesley combines them: the kingdom is in the midst of you, present in the soul of every true believer, a spiritual kingdom and an inward principle. MacArthur takes it as the human heart and thinks it unlikely that Jesus meant the Pharisees themselves. Matthew Henry stresses that the Kingdom does not change a person’s outward circumstances first; it changes the heart and the life.

The New Geneva Study Bible notices that in this one passage Jesus speaks of the Kingdom both as a reality that already exists and as something still to be fully revealed (verses 22-37). That is why Jesus taught us to pray that the Kingdom would come (Matthew 6:10). Christians who agree on this still differ about how the future Kingdom unfolds: some expect a thousand-year reign of Christ on earth (Revelation 20:4), others see that reign as His present rule or take the passage symbolically. All agree that He will return as King.

What the Kingdom looks like now

Paul shows what life in the Kingdom looks like in a church where believers argued about food.

For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.

Rom 14:17 · King James Version (1769)

MacArthur describes the Kingdom here as the sphere of salvation, where God rules the hearts of those He has saved. Righteousness means a holy life of obedience, and peace is the calm of Spirit-given love between believers and God and between each other. MacDonald draws the point: in the Kingdom, spiritual realities count, not dietary rules. The New Geneva Study Bible adds that the Kingdom is defined by gifts of grace from above, not by food and drink. Lopukhin notes that Paul usually means the Messianic Kingdom that comes at Christ’s return, but here he speaks of it as it already shows itself in believers’ lives.

Entering this Kingdom is not a matter of birth or effort; Jesus said a person must be born again to see it (John 3:3).

Seek it first

Jesus tells His listeners not to be anxious about food and clothing, and gives this priority.

But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.

Matt 6:33 · King James Version (1769)

MacArthur says the Kingdom here is tied to salvation: seek that first and God will take care of the rest. The New Geneva Study Bible explains that what must come first is God’s sovereign will and a right relationship with Him, which is the meaning of “righteousness.” Worry and righteousness do not go together, because worry doubts God’s goodness or power. MacDonald reads it as a promise: put God’s interests first and He pledges to provide what you need.

To seek the Kingdom is to ask what the King wants: to trust Jesus, to obey Him in ordinary days and to treat people the way He does. Anyone who has bowed to Him already belongs to it, and it is still growing.