“To practice magic is to be a quack; to know magic is to be a sage.”
Source: Miscellaneous Quotes On the Subjects of Magic and Magicians
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Eliphas Levi 22
French writer 1810–1875Related quotes

Though written in contemporary idiomatic English, this has been recently cited on the Internet on various "quotations" websites (and elsewhere) as having being written by Lewis Carroll in Alice in Wonderland [sic]. However, it does not appear within the text of Alice's Adventures in Wonderland or Through the Looking-Glass. It was actually a line spoken by a character named Jefferson in Once Upon a Time (TV series) in a 2012 episode entitled "Hat Trick," in which the literary character The Mad Hatter appears. – Ref: Internet Movie Database (IMDb), quotes from Once upon a Time, "Hat Trick" http://www.imdb.com/title/tt2104520/quotes.
Misattributed
The Satanic Bible (1969)

“The Science you don't know looks like magic.”
Kona, in Ch. 30
Fluke, or, I Know Why the Winged Whale Sings (2003)

“It's still magic even if you know how it's done.”
Variant: It doesn't stop being magic just because you know how it works.
Source: A Hat Full of Sky