"We, performers, work on willpower. This willpower works in a short term, not durational."

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You should be unconcerned about short-term price action when you own the securities directly, just as you were unconcerned when you owned them indirectly through BPL. I think about them as businesses, not "stocks", and if the business does all right over the long term, so will the stock.

— Warren Buffett