I much fear that British juries have not yet attained that pitch of intelligence when they will give the preference to my theories over Lestrade's fa… - Arthur Conan Doyle

"Dr. Watson's summary list of Sherlock Holmes's strengths and weaknesses:

"1. Knowledge of Literature: Nil.
2. Knowledge of Philosophy: Nil.
3. Knowledge of Astronomy: Nil.
4. Knowledge of Politics: Feeble.
5. Knowledge of Botany: Variable. Well up in belladonna, opium, and poisons generally. Knows nothing of practical gardening.
6. Knowledge of Geology: Practical but limited. Tells at a glance different soils from each other. After walks has shown me splashes upon his trousers, and told me by their colour and consistence in what part of London he had received them.
7. Knowledge of Chemistry: Profound.
8. Knowledge of Anatomy: Accurate but unsystematic.
9. Knowledge of Sensational Literature: Immense. He appears to know every detail of every horror perpetrated in the century.
10. Plays the violin well.
11. Is an expert singlestick player, boxer, and swordsman.
12. Has a good practical knowledge of British law.

"Well Holmes", I murmured, "have you found anything out?"
He stood beside me in silence, his candle in his hand. Then the tall, lean figure inclined towards me. "I say, Watson", he whispered, "would you be afraid to sleep in the same room with a lunatic, a man with softening of the brain, an idiot whose mind has lost its grip?"
"Not in the least," I answered in astonishment.
"Ah, that's lucky," he said, and not another word would he utter that night.

There are no fools so troublesome as those of the mind