I think quirrel is Harry from the future. Harry decided not to mess with time until he's older, but maybe once he's older he realized that he can break the time travel restriction rules and travel years into the past. This could possibly explain why quirrel knows so much about Harry. It also explains their magic interaction possibly. This would also explain how quirrel is so rational, whereas it would be surprising that Harry would randomly run into someone as rational as himself in the small number of people he's met in the wizarding world. Quirrel could'... (read more)
Quirrel had a very low opinion of science and didn't seem to appreciate the power it confers until the most recent chapter - which doesn't gel well with what we know of Harry. Of course, future-harry could be lying about that when interacting with his past self, but that would require a complexity penalty against the hypothesis.
I think quirrel is Harry from the future. Harry decided not to mess with time until he's older, but maybe once he's older he realized that he can break the time travel restriction rules and travel years into the past. This could possibly explain why quirrel knows so much about Harry. It also explains their magic interaction possibly. This would also explain how quirrel is so rational, whereas it would be surprising that Harry would randomly run into someone as rational as himself in the small number of people he's met in the wizarding world. Quirrel could'... (read more)