Interesting question, read something way back were Gary Gygax explained his take on the difference between wisdom and intelligence. IIRC, he said "The author (himself) is intelligent enough to know smoking is bad for you, but not wise enough to stop"
Priests magic is bestowed by gods/spirits so you need wisdom or discipline to adhere to their order?
Mages discover their art, akin to science based magic you have to be smart enough to grok/understand the fabric of creation?
I dunno my early morning take on the subject.
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