A magician does not send messages, you know—he orchestrates reality. - Michael Swanwick

I trust I have not grown so gullible as to consult a doctor," the bureaucrat said with dignity. "If I want medical attention, I hall employ the qualified machinery or, in extremis, a human with proper biomedical augmentation. But I will not swill down fermented swamp guzzle at the behest of some quasi-literate, uneducated charlatan.

Indeed, what is magic but impossible science?

Now why on Earth would you tell him a thing like that?"
"Because it's true."
Sbrulius laughed. "That, dear Faust, is the single worst argument you could have raised. Many things are true. Few are proper. Fewer still are desirable.