[…] it appears that Jesus was aware of a great battle in which he was already involved and that would, before too long, reach some kind of climax.
This was not, it seems, the battle that his contemporaries, including his own followers, expected him to fight. It wasn’t even the same sort of battle – though Jesus used the language of battle to describe it. Indeed, as the Sermon on the Mount seems to indicate, fighting itself, in the normal physical sense, was precisely what he was not going to do. There was a different kind of battle in the offing, a battle that had already begun. In this battle, it was by no means as clear as those around Jesus would have liked who was on which side, or indeed whether ‘sides’ was the right way to look at things. The battle in question was a different sort of thing, because it had a different sort of enemy.
— Tom Wright, Simply Jesus