" For the true magician there is no very clear line between what lies inside the mind and what lies outside it.If you desire something, it will become substance. If you despise it, you will see it destroyed. A master magician is not much different from a child or a madman in that respect. It takes a very clear head and a very strong will to operate once you are in that place. And you will find out very quickly whether or not you have that clarity and that strength. "

― Lev Grossman , The Magicians (The Magicians, #1)