As we progress on our trading journey we naturally come up with dozens of Rules that help us stay on track. Those rules are personal and reflect our individual strengths and weaknesses…especially our blindspots. As we evolve, our priorities change. Rules we needed a year ago might not be as important now. We have integrated the lesson. There is however, one non-negotiable “Prime Directive.” It doesn’t hange over time. It’s not a rule, it’s an imperative. It’s the One Thing that will determine your long-term success. If you obey it, everything gets easier. If you ignore it, you’ll find yourself fighting your own brain.