igoriss/iStock via Getty Images When it comes to investing, particularly value investing, you should be prepared to be wrong for a long period of time. The very nature of value investing involves buying stocks that are discounted, often because they are either overlooked by the market or unpopular. They may not be the healthiest companies, but they are still trading on the cheap. Of course, there's a fine line between buying a discounted stock and buying what is destined to be a falling knife. And even the ...