In Mark 3:24-26, we read:
And if a kingdom be divided against itself, that kingdom cannot stand. And if a house be divided against itself, that house cannot stand. And if Satan rise up against himself, and be divided, he cannot stand, but hath an end.
Mark 3:24-26
This is the nature of truth and falsehoods:
If everyone believes in the truth and does not believe in falsehoods, everyone can live in perfect harmony without division.
But if people believe in falsehoods, they will become divided since falsehoods often are not in agreement with each other. Any one truth, however, is always in agreement with all other truths.
This is what Jesus means in Matthew 10:34-36 when He says that He brings not peace, but a sword. The sword is the word of God, which is the truth. Truth causes division among those who believe in falsehoods as the truth cuts through lies, exposing the falsehoods for what they are.
Surely, there will be great conflict within the fallen angels while Satan’s kingdom is falling apart, especially as a result of the war in heaven mentioned in Revelation 12 when Satan and the fallen angels lose their place in the heavens, being thrown down to earth. The fallen angels will lose their trust in Satan, putting all of the fallen angels into chaos and confusion. If Satan alone is stuck down, then his entire army of fallen angels will crumble apart from within. Strike the head and the body will fall. Because Satan’s kingdom is built on a lie, its inevitable fate is to collapse because of that very same lie. The word of God will win in the end, destroying the falsehoods of Satan. Jesus Himself is the Word made flesh (John 1:14), and He is the truth (John 14:6). It is Jesus who will ultimately destroy the works of Satan.
He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.
1 John 3:8
