Varys: I still dream of that night. Not of the sorcerer, not of his blade. I dream of the voice from the flames. Was it a god? A demon? A conjuror’s trick? I don’t know. But the sorcerer called and a voice answered. And ever since that day, I have hated magic and all those who practice it. But you can see why I was eager to aid in your fight against Stannis and his Red Priestess. A symbolic revenge of sorts.

From Game of Thrones – Season 3 Episode 4: ‘And Now His Watch Is Ended’ (3×04)