Having to do with matters difficult to comprehend.
My mind rebels at stagnation. Give me problems, give me work, give me the most abstruse cryptogram, or the most intricate analysis, and I am in my own proper atmosphere. I can dispense then with artificial stimulants. But I abhor the dull routine of existence. I crave for mental exaltation.
—Sir Arthur Conan Doyle The Sign of Four (1890)
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