Using magic defies logic
But magicians did this all the time, she reminded herself. Did they keep a store of anger and hate to draw upon at all times? What kind of people were they?So, these wizards, they seem pretty calm and collected, right? They're not. If they draw their powers from their emotions, this means of course that they are emotionally unstable and prone to bizarre fits, or in the other extreme, it means they are incapable of emoting normally at all, since any little grin might shatter reality forever. And this is only considering their power has a purely emotional source. Power that comes from the mind means things like understanding and accepting magic. At the very least this means going against common consensus that "magic isn't real." But, on a much larger level, it effectively implies creating and living within your own reality system. That is, if your magic is only believed to be real by a very small part of the population, it won't even work on normals, and you're effectively crazy. Even if you're right and magic does work on them, you're still crazy, for accepting something so strongly that is so counter to the reality everyone else lives in. For this reason, in the work in question, Wizards Are Crazy.
The Black Magician Trilogy, "The Magician's Guild"