The difference between a good and a bad trader isn't the number of mistakes they make, but rather their attitude towards those mistakes and their position sizing. The worst traders are often the ones who make the most profits and the fewest mistakes over a given period. In every major stock market bull run, the best-performing funds are often the ones that suffer the most at the end. Even worse, in every bull market, some well-known fund managers have committed suicide due to the pressure of declining performance.