As ever, Watson, you see but do not observe. To you, the world remains an impenetrable mystery, whereas to me it is an open book. Hard logic versus romantic whimsy. That is your choice. You fail to connect actions to their consequences. Now, for the last time. If you want to keep the rattle, do not throw the rattle.
— Why do they affect me so, Professor? I mean, more than everyone else...
— Dementors are among the foulest creatures that walk this earth. They feed on every good feeling, every happy memory, until a person is left with nothing but his worst experiences. You're not weak, Harry. The Dementors affect you most, because there are true horrors in your past. Horrors your classmates can scarcely imagine. You have nothing to be ashamed of.