Marty has scored enormous percentage gains in every year since he turned full time trader in 1979, but he has done so without ever losing more than 3 percent of his equity on a month-end to month-end basis. In the US Investing Championships held by Stanford University Professor Norm Zadeh, his performance was nothing short of astounding. In nine of the ten four-month championships he entered, he made more money than all the other traders combined. His average return in these nine contests was 210 percent – non annualized! In his single entry in a one-year contest, he scored a 781 percent return.  

“I turned from a loser to a winner when I was able to separate my ego needs from making money. When I was able to accept being wrong. Before that, admitting I was wrong was more upsetting than losing the money.” 
”When I became a winner I went from ‘I figured it out, therefore it can’t be wrong’ to ‘I figured it out, but if I’m wrong, I’m getting the hell out, because I want to save my money and go on to the next trade.”
”By living the philosophy that my winners are always in front of me, it is not so painful to take a loss. If I make a mistake, so what! “
”Before taking a position always know the amount you are willing to lose.”
”The most important thing is money management, money management, money management. Anybody who is successful will tell you the same thing.”
”I always take my losses quickly. That is probably the key to my success.”
”The best advice I can give to the ordinary guy trying to become a better trader is Learn to take losses. The most important thing in making money is not letting your losses get out of hand.