The divided kingdom teaches that Satan cannot be defeated by Satan working against himself.

²⁵And Jesus knew their thoughts, and said unto them, Every kingdom divided against itself is brought to desolation; and every city or house divided against itself shall not stand:

²⁶And if Satan cast out Satan, he is divided against himself; how shall then his kingdom stand?

²³And he called them unto him, and said unto them in parables, How can Satan cast out Satan?

²⁴And if a kingdom be divided against itself, that kingdom cannot stand.

²⁵And if a house be divided against itself, that house cannot stand.

²⁶And if Satan rise up against himself, and be divided, he cannot stand, but hath an end.

¹⁷But he, knowing their thoughts, said unto them, Every kingdom divided against itself is brought to desolation; and a house divided against a house falleth.

¹⁸If Satan also be divided against himself, how shall his kingdom stand? because ye say that I cast out devils through Beelzebub.