“I’d been curious whether the science side or magic side was superior, but this makes sense. They refine their lifeforce into magic power. I don’t know how exactly it works, but it looks like magicians as a whole know how to handle problems affecting the mind. They must have some kind of auto-fuse that shuts down their mind as soon as something tries to take control.”

Toaru Majutsu no Index New Testament vol.22R ch.3 pt.2