My mind,” he said, “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. That is why I have chosen my own particular profession, or rather created it, for I am the only one in the world.”