The Kingdom of God

When the joy of the kingdom is spoken of, it is the kingdom of God. "The kingdom of God [not of heaven] is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost." The kingdom of heaven is dispensational; the kingdom of God is sometimes a moral thing.
Christ is not taking possession of the kingdom on the earth now. He is not sitting on His own throne yet. It is the Father's throne where He is. He is perfectly accepted in divine righteousness, which is now being ministered by the Holy Spirit to faith, and which is better than any other portion, but there is no execution of judgment. If He had executed judgment when He went away, there would have been no dealings in grace. He must have extinguished the wicked from the earth at once.
The word is, "Sit Thou at My right hand, until I make Thine enemies Thy footstool." There He is sitting down and doing nothing as to the kingdom, but sowing, etc., in this mysterious way. Meanwhile the mustard tree, in which the birds of the air (the emissaries of Satan) may lodge, is being produced. The leaven is spreading in the three measures of meal; that is, formal doctrine extends itself through Christendom. At the close Christ brings in the execution of His power.