This is so Luna, wise and benignly addled at the same time:
Luna had always been fascinated with the sky. There was so much of it. And it was all just ... there. It was peaceful. It couldn't fight or defend itself, but there was no way to attack it. It was innocent. But in an odd way it wasn't. The sky saw everything, so it couldn't be innocent, if it knew everything. Could it?
So simple and so deep at the same time. I like her takes on her riends too, that Ron and Neville are undervalued, that Harry will do fine, that Ginny needs some self-control