One has to realize that it’s much easier to buy a stock than it is to hold it or sell it. Although one doesn’t necessarily need to have conviction when buying a stock, holding a stock requires considerable research, devotion of time, and conviction, often in the face of extended downturns or a sideways market, even if one knows that the underlying business fundamentals are strong. The act of selling a stock is even harder and often the source of regrets among investors. People often have trouble letting go of a stock they’re mentally, and sometimes emotionally, invested in, even if the stock should be sold. Sometimes, people sell too soon and then regret it later.