If Quirrell is the host of Voldemort, who regards Harry as his arch-nemesis, is he planting intentionally dysfunctional ideas in Harry's mind? Like in the PKD story "War Game", where the aliens send a board game to Earth from which kids learn to be terrible at finances.
In particular, I wonder if we the readers are supposed to take that the whole "learning to lose" thing as a lesson or an anti-lesson on what NOT to do.