One You need to be able to persist and keep committed to your goal of being successful for the long haul.  If there is nothing that is going to stop you from being a trader you will get there.

Two You do need to know when to quit but not as relates to the above point.  You need to know when to quit a trade, a theory, a strategy and you need the wisdom from your persistence at this business to know how and when to do this.

Three You’ve always got to be flexible.  You have to duck and dive with the best of them.  You’ve got to be able to change direction on a dime or you’re dead meat in this game.