1. Hell "on earth" exists to the degree that we believe that we are actually SEPARATED from God. In other words, our world becomes hell to the extent that we do NOT know the sacramental/theophanic nature of our created universe.
2. We live "on earth as it is in heaven" to the degree that we live the Truth of our unity with God, as we act as "living temples" for the life of the Trinity within the created universe. Then, our world is revealed to be "crammed with heaven" to the extent that we do know the sacramental nature of our created universe
Lord Jesus Christ, Son of God, have mercy on me, a sinner.