It's brain," I said; "pure brain! What do you do to get like that, Jeeves? I believe you must eat a lot of fish, or something. Do you eat a lot of fish, Jeeves?"
"No, sir."
"Oh, well, then, it's just a gift, I take it; and if you aren't born that way there's no use worrying.

Auteur: P.G. Wodehouse