"It's how you actually do the magic. Things that are well below your level, or really trivial even if you're also very low-level, you can mostly do it just by concentrating, but to do anything closer to your limits you cultivate a sort of indignation that the universe had the nerve to be in a way that does not meet your approval. And then the universe will rearrange itself in search of your approval, because mine is better than yours."