Terry Pratchett on Magic (supernatural)

“The senior wizard in a world of magic had the same prospects of long-term employment as a pogo stick tester in a minefield.”

“Too much magic could wrap time and space around itself, and that wasn't good news for the kind of person who had grown used to things like effects following things like causes.”

“A Thaum is the basic unit of magical strength. It has been universally established as the amount of magic needed to create one small white pigeon or three normal-sized billiard balls.”

“"'''''This'' is the school, isn't it. The magic place? The world. Here. And you don't realize it until you look.''' Do you know the pictsies think this world is heaven? We just don't look. You can't give lessons on witchcraft. Not properly. It's all about who you are... you, I suppose."”

“Magicians and scientists are, on the face of it, poles apart. Certainly, a group of people who often dress strangely, live in a world of their own, speak a specialized language and frequently make statements that appear to be in flagrant breach of common sense have nothing in common with a group of people who often dress strangely, speak a specialized language, live in … er ...”