Keynes disdained inside information — in fact, he once declared that Wall Street traders could make huge fortunes if only they would disregard their "inside" information — and his own oracles were nothing but his minute scrutiny of balance sheets, his encyclopedic knowledge of finance, his intuition into personalities, and a certain flair for trading.
Chapter IX, John Maynard Keynes, p. 248-249 - The Worldly Philosophers (1953)