Commandment No. 2: First Loss Is Best

Editor's note: Jim Cramer's new book, Real Money: Sane Investing in an Insane World, is available in selected bookstores now. As a special bonus to RealMoney readers, we will be running Cramer's "Ten Commandments of Trading." For more about the new book and to order it, click here. To learn his "Twenty-Five Rules of Investing," click here. To read Cramer's first commandment, click here. Today, we present Cramer's second commandment.

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Good trading, no matter what it's based on, technicals, fundamentals, the stars, the news, requires a level of discipline that goes against human nature. We are taught in life to be patient, to let things work out, not to be hasty, yet none of that works when it comes to trading. You have to be willing to cut and run, to use that "flight," not fight, instinct that we supposedly are born with but suppress wholeheartedly when we are grown up. ...