There's a lot of Dark Magic in your family, yes, I won't deny that. But there have been plenty of Slytherins who have had nothing to do with the Dark Side of magic. But I must warn you, Myrddin, the Sight is no easy gift. The future is a very complicated matter. When you know it, the certainty that something will happen can sometimes be impossible, but still you know, and it is very confusing, and that's only one problem.
Many Seers go mad.
Others surpress thier ability, and then end up working themselves into a corner faking predictions. Then she stood up, and Myrddin, guessing the interview was over, did likewise. But there was something else he wanted to know. They have been lovers for years. I need hardly tell you not to tell anyone.