Discipline - The Last Necessity

However you buy and sell stocks--fundamentally or technically--over the long-term or short-term, you must have discipline. You have to decide on a course of action and stick to it. It will make you consistent and consistency will, in the long run, lead to profitability.

If you notice over time that your strategy or discipline isn't working for you, change your course, but never do so emotionally. Emotion has no place in a portfolio.