"Ron hadn’t noticed you were a girl, in the proper sense," James went on. "And so Harry didn’t either. But, at the same time, you’d done things for Harry that he never told Ron about, things he kept so private he'd never tell anyone. You’d become his voice of reason and conscience. If Harry was doing wrong or not trying hard enough, he’d feel guilty over what you would think about it. Nobody else, just you. And if Harry was considering a reckless action, he’d be put off if the voice in his head ... which was your voice, by the way ... told him not to.