My mistake was to project my skill beyond the limits of experience. I began investing outside the industries which I believe I thoroughly understood, in completely different spheres of activity; situations where I did not have comparable background knowledge.

Even in those earlier times, finding the really outstanding companies and staying with them through all the fluctuations of a gyrating market proved far more profitable to far more people than did the more colorful practice of trying to buy them cheap and sell them dear.

History has shown that in every age and in every field of human knowledge, many of the views which almost everyone accepted as true and never bothered to think about further, were in time proven completely wrong.

One, which I mention several times elsewhere, is the need for patience if big profits are to be made from investment. Put another way, it is often easier to tell what will happen to the price of a stock than how much time will elapse before it happens. The other is the inherently deceptive nature of the stock market. Doing what everybody else is doing at the moment, and therefore what you have an almost irresistible urge to do, is often the wrong thing to do at all.

I remember my sense of shock some half-dozen years ago when I read a recommendation to sell shares of a company ... The recommendation was not based on any long-term fundamentals. Rather, it was that over the next six months the funds could be employed more profitably elsewhere.

I had made what I believe was one of the more valuable decisions of my business life. This was to confine all efforts solely to making major gains in the long-run.

My mistake was to project my skill beyond the limits of experience. I began investing outside the industries which I believe I thoroughly understood, in completely different spheres of activity; situations where I did not have comparable background knowledge.