We don't buy and sell stocks based upon what other people think the stock market is going to do (I never have an opinion) but rather upon what we think the company is going to do. The course of the stock market will determine, to a great degree, when we will be right, but the accuracy of our analysis of the company will largely determine whether we will be right. In other words, we tend to concentrate on what should happen, not when it should happen..................
Related book: Warren Buffett's Ground Rules: Words of Wisdom from the Partnership Letters of the World's Greatest Investor