John 18:36 - Jesus said, "My kingdom is not of this world. If it were, my servants would fight to prevent my arrest by the Jews. But now my kingdom is from another place."
Jesus' kingdom is from heaven and is thus not based upon the same structures as an earthly kingdom. But notice that Jesus did not say "My kingdom is in another world." Jesus intended for his kingdom to exist here on earth, which it does in his church. So we are citizens of a heavenly kingdom while living on the earth. We live according to the law of that kingdom and we persuade people with the gospel, not with a sword.
