"The very fact that God states that the serpent was now to crawl upon his belly, which obviously he had not done before, reveals that there was a descending from one realm to another, from a greater to a lesser, from a higher and more mobile to a lower and more confined. Moving on his belly limits the sphere of the serpent’s activity, now he can only creep along the ground. Previously he had access to loftier realms, his sphere of activity extended to higher domains — exalted realms of pure spirit expression — but he is now lowered to the dust-realm, into the world of the natural man, confined to the earthly and sensual, and restricted to action upon and expression through THE MAN OF DUST, as the Lord pronounced to Adam in that same encounter, “In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for DUST THOU ART, AND UNTO DUST SHALT THOU RETURN” (Gen. 3:19). And to the serpent he said, “And dust (the fleshly, carnal nature of man) shalt thou eat all the days of thy life” (Gen. 3:14). Truly this accounts for the words of the apostle, “And you hath He quickened, who were dead in trespasses and sins: wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, THE S-P-I-R-I-T THAT NOW WORKETH I-N THE CHILDREN OF DISOBEDIENCE” (Eph. 2:2)."
"Ah, yes, this evil spirit is IN MAN! When the ancient serpent was lowered into the dust realm, to crawl upon his belly and eat (find his satisfaction and fulfillment in) dust, man became the base of operation for his activity. I do not hesitate to tell you, my beloved, that you will find Satan operative in NO OTHER REALM in the whole universe! You do not meet the devil in rocks, trees, mountains, rivers, clouds, fish, birds, animals, nor on far-away planets, in distant galaxies, in flying saucers, nor in any other object or location outside of man. Can we not see that under the curse God limited Satan to the dust of the earth, to the realm of the first Adam, the natural man, the carnal mind — the man of dust! “The first man is of the earth, earthy: the second man is the Lord from heaven” (I Cor. 15:47)."
Much more in the link:
https://www.godfire.net/eby/rev217.html
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"There are many commonly held theories about your adversary. Notice I said, “your adversary.” Satan is not God’s adversary. There is not one scripture in the whole Bible that speaks of Satan as an adversary of God! The preachers don’t know that. The churches don’t know that. Even the professors in the theological seminaries have never studied deeply enough to discover that. God doesn’t have any enemies — they are all under His feet! That is not semantics, it is not just a cute or clever play on words — that’s the truth. “Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about (in man), seeking whom he may devour” (I Pet. 5:8). Your adversary the devil is your adversary. That means two things. First, he is not God’s adversary. Second, we do have an adversary. In the realm of God’s Spirit and the Christ life he is defeated. He is on a short leash, but he still has a mouth — influence. The book of Revelation speaks of the mouth of the dragon which speaks great things and blasphemies. He wasn’t always a dragon; he started out first as just a little serpent, one who hisses. That is the meaning of the word for serpent in the Old Testament Hebrew. He was a hisser. Now as a dragon he has a mouth speaking great things!"
"And the only thing that will defeat the mouth of the dragon is the MOUTH OF THE LORD! The chain in the angel’s hand with which he binds the devil is the chain of TRUTH — THE LIVING WORD OF GOD!"