"I say now, as I said then, that a man should keep his little brain-attic stocked with all the furniture that he is likely to use, and the rest he can put away in the lumber-room of his library, where he can get it if he wants it."
Interesting point, Holmes. And here's another fun Holmes tidbit: the man in the picture there will BE Sherlock Holmes at your next party or event; I discovered this while looking for pictures of Holmes online. To find out more about the Holmes impersonator, click here.
As to why Holmes, Conan-Doyle's Holmes, did what he did, he explained that quite clearly in "The Adventure of the Bruce-Partington Plans:"
"I play the game for the game's own sake."