The kingdom of God, like any other kingdom, cannot be within a man; it is something within which a man can live. - Albert Nolan

The much quoted text, “My kingdom is not of this world” (John 18:36) does not mean that the kingdom is not, or will not be, in this world or on this earth. … When Jesus and his disciples are said to be in the world but not of the world, the meaning is clear enough. Although they live in the world they are not worldly, they do not subscribe to the present values and standards of the world. … The values of the kingdom [of God] are different from, and opposed to, the values of this world. There is no reason for thinking that it means the kingdom will float in the air somewhere above the earth or that it will be an abstract entity without any tangible social and political structure.

The Christian belief in heaven originated after the death of Jesus with the idea that he had been taken up into heaven or exalted to the right hand of God.

Many Christians have been misled for centuries about the nature of God’s kingdom by the well-known mistranslation of Luke 17:21: “The kingdom of God is within you.” Today all serious scholars and translators would agree that the test should read: “The kingdom of God is among you or in your midst.” The Greek word entos can means “within” or “among.”