A.T. Robertson Commentary Luke 11:17

"But he, knowing their thoughts, said unto them, Every kingdom divided against itself is brought to desolation; and a house [divided] against a house falleth." — Luke 11:17 (ASV)

But he (αυτος δε). In contrast with them.

Knowing their thoughts (ειδως αυτων τα διανοηματα). From διανοεω, to think through or distinguish. This substantive is common in Plato, but occurs nowhere else in the N.T. It means intent, purpose. Jesus knew that they were trying to tempt him.

And a house divided against a house falleth (κα οικος επ οικον πιπτε). It is not certain that διαμερισθεισα (divided) is to be repeated here as in Mt 12:25; Mr 3:25. It may mean,

and house falls upon house , "one tumbling house knocking down its neighbour, a graphic picture of what happens when a kingdom is divided against itself" (Bruce).