" I resurrect this “market-guessing” section only because after the Dow declined from 995 at the peak in February to about 865 in May, I received a few calls from partners suggesting that they thought stocks were going a lot lower. This always raises two questions in my mind: (1) if they knew in February that the Dow was going to 865 in May, why didn’t they let me in on it then; and, (2) if they didn’t know what was going to happen during the ensuing three months back in February, how do they know in May? There is also a voice or two after any hundred point or so decline suggesting we sell and wait until the future is clearer. Let me again suggest two points: (1) the future has never been clear to me (give us a call when the next few months are obvious to you—or, for that matter the next few hours); and, (2) no one ever seems to call after the market has gone up one hundred points to focus my attention on how unclear everything is, even though the view back in February doesn’t look so clear in retrospect. If "

― , Warren Buffett's Ground Rules: Words of Wisdom from the Partnership Letters of the World's Greatest Investor