I believe that having the discipline to follow your rules is essential. Without specific, clear, and tested rules, speculators do not have any real chance of success. Why? Because speculators without a plan are like a general without a strategy, and therefore without an actionable battle plan. Speculators without a single clear plan can only act and react, act and react, to the slings and arrows of stock market misfortune, until finally they are defeated.

—Jesse Livermore