the kingdom of God refers to the second coming of God's precious son Jesus Christ who is to return anytime from now to judge them that believe on him and those that have not yet believed on him,including both the dead and the living.

 this in short means that already the kingdom is at hand, we daily live with it, however, the second return implies that we are going to beexamined thoroughly to see if indeed we have been living upto the standards of the kingdom or we have been living on own standards, then those that qualify shall be crowned with the gift of eternal life, while them that will not qualify shall be condemned into everlasting destruction through fire.