Elites growing weary about the war?
I've often seen it said that towards the later part of the Human-Covenant war, some in Sangheili leadership were growing weary about the war, the toll it was having, and felt that humanity had proved themselves to a degree and were confused about the Prophets being so set on annihilating them. Obviously the events on Alpha Halo and later the Great Schism would've changed such sentiments.
I think I've seen it on Reddit here and on Halopedia a while ago, but I've never seen a source for this - is it in a book somewhere?