"No," Harry said flatly, "learning only gives you the benefit of knowing." It was brutal, harsh and the truth but it still made Harry's stomach turn to say it. "Nothing can change what's happened. Molly's already lived it." Harry looked at his apprentice. Was she still his apprentice? Or his Lady?
"But knowing what does happen can hurt you, and others, and you may want to change it." But one couldn't. Harry exhaled a breath, "And the wanting may push you into doing things you wouldn't consider otherwise. I don't know."