I cannot live without brainwork. What else is there to live for? Stand at the window here. Was ever such a dreary, dismal, unprofitable world? See ho… - Arthur Conan Doyle

"It is cocaine," he said, "a seven-per-cent solution. Would you
care to try it?"
"No, indeed," I answered brusquely. "My constitution has not got
over the Afghan campaign yet. I cannot afford to throw any extra
strain upon it."
He smiled at my vehemence. "Perhaps you are right, Watson," he
said. "I suppose that its influence is physically a bad one. I find
it, however, so transcendently stimulating and clarifying to the
mind that its secondary action is a matter of small moment."

I would not bring one shadow on his life, and this I know would break his noble heart.

My dear fellow,” said Sherlock Holmes as we sat on either side of the fire in his lodgings at Baker Street, “life is infinitely stranger than anything which the mind of man could invent.