The Truth Shall Make You Free (1943) pp.284-285, ch.XXii "THE TIME OF THE END"
The superficial appearance of our literal earth was greatly changed by the addition of the flood from the fallen water canopy, but upon this same earth another visible organization of ungodly men was built up. It dates particularly from the time of the founding of Nimrod's kingdom at Babel, or Babylon, and it has spread over all the earth. This human, visible organization of religion, commerce and politics makes up the symbolic "earth", and men think it will endure just as long as our earthly planet does. Our planet earth is surrounded by an invisible air mass, which is the "firmament" or expanse of atmosphere extending up about one hundred miles higher than man. In like manner the symbolic "earth" has invisible spirit powers in control of it, namely, the demons under Satan the Devil. This organization of wicked spirits with Satan as their prince is both higher than man and unseen to him. Hence that demon organization constitutes the "heavens" with relation to man's present earthly organization. Man on earth can no more get rid of these demonic "heavens" than man can by airplane or rockets or other means get up above the air envelope which is about our earthly globe and in which man breathes. God alone can and will deliver humankind from such demon powers of control.