“Mystery is a word with no objective pertinence, merely describing the limitations of a mind. In fact, a mind may be classified by the order of the phenomena it considers mysterious.… The mystery is resolved, the solution made known. “Of course, it is obvious!” comes the chorus. A word about the obvious: it is always obvious.… The common mind transposed the sequence, letting the mystery generate the solution. This is logic in reverse; actually the mystery relates to the solution as the foam relates to the beer.…”
The Unspeakable McInch (p. 39; all ellipses in the original)
Short fiction, The Many Worlds of Magnus Ridolph (1966)
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Jack Vance 213
American mystery and speculative fiction writer 1916–2013Related quotes
“There is no mystery whatever — only inability to perceive the obvious.”
All Else Is Bondage : Non-Volitional Living (1964)

" The Life and Teachings of Thoth Hermes Trismegistus http://magdelene.net/Thoth%20Hermes%20Trismegistus.htm", in The Secret Teachings of All Ages (1928) by the Canadian occultist Manly Hall; a few quotation websites credit this to Addison.
Misattributed

A Hundred and Seventy Chinese Poems (1919), Introduction, p. 18

Mysterious Answers To Mysterious Questions http://lesswrong.com/lw/iu/mysterious_answers_to_mysterious_questions/ (August 2007); Yudkowsky credits the map/territory analogy to physicist/statistician Edwin Thompson Jaynes.

“Every religion is the product of the conceptual mind attempting to describe the mystery.”

On the Alex Jones Radio show, as quoted in "David Lynch Questions 9/11 On National U.S. Radio" in Prison Planet (25 January 2007) http://www.prisonplanet.com/articles/january2007/250107lynchquestions.htm