When it comes to investing, few know the rules of the road better than the Oracle of Omaha, Warren Buffett. Over the years, he's stuck to his guns, espousing the advantages of value investing, holding stocks for the long haul, and remaining cool, calm, and collected during the most turbulent market storms. He attributes much of his success to an almost inhuman ability to discipline his emotions. Perhaps even more impressive, however, is Buffett's contrarian streak, which can be summarized in the oft-cited quote: "Be fearful when others are greedy, and greedy when others are fearful."

http://www.fool.com/investing/general/2012/05/27/dont-fear-the-dows-drop.aspx