Mark 3:24-26 says:
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 (KJV)
Jesus seems to make comparisons, that nothing that is divided against itself can stand. Not a kingdom, not a house, not Satan. Why did Jesus add the 'rising up against himself' in the case of Satan? Is that because Satan is only one 'person' versus kingdoms (and households) consisting of multiple persons, who can be divided against one another?