"I dreamed I was buying new shoes last night," said Ron. "What d'ya think that's gonna mean?" "Probably that you're going to be eaten by a giant mars… - J.K. Rowling

Every second he breathed, the smell of the grass, the cool air on his face, was so precious: To think that people had years and years, time to waste, so much time it dragged, and he was clinging to each second.

There is a huge appeal, and I try to show this in the Potter books, to black and white thinking.
It's the easiest place to be and in many ways it's the safest place to be. If you take an all-or-nothing position on anything, you will definitely find comrades, you will easily find a community. "I’ve sworn allegiance to this one simple idea."
What I've tried to show in the Potter books, and what I feel strongly myself, is that we should mistrust ourselves most when we are certain.

"Don't talk to me."
"Why not?"
"Because I want to fix that in my memory for ever. Draco Malfoy, the amazing bouncing ferret..."