"Postulates are based on assumption and adhered to by faith. Nothing in the Universe can shake them."

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Investors should be skeptical of history-based models. Constructed by a nerdy-sounding priesthood using esoteric terms such as beta, gamma, sigma and the like, these models tend to look impressive. Too often, though, investors forget to examine the assumptions behind the models. Beware of geeks bearing formulas.

— Warren Buffett